Every Networking Technology Explained In 31 Minutes!

Right now, while you're watching this video, you're using at least one networking technology. Probably two or three at the same time. Your phone is on Wi-Fi. Your earbuds are on Bluetooth. Your router is connected to a fiber-optic cable buried under the street. And somewhere way above your head, a satellite is beaming internet to a farmer who lives three hours from the nearest city. We have a lot of ways to move data around. Some are fast. Some are slow. Some work across oceans. Some only work if you're standing four centimeters away. And they're all built for different jobs. Most people use these technologies every single day without knowing how any of them actually work. So let's go through all of them, one by one. And I'll explain each one in a way that actually makes sense. Wi-Fi Let's start with the most obvious one. Wi-Fi. You use it at home. You use it at the coffee shop. You ask for the Wi-Fi password the second you walk into a hotel room. It's the most common way people connect to the internet without plugging anything in. Here's how it works. You have a router. That box sitting in the corner of your house. That router is physically connected to the internet. Usually through a cable from your internet provider. Wi-Fi is the wireless bridge between your device and that router. Your phone sends data as radio waves. The router picks them up, sends them to the internet, gets the response back, and sends it to your phone. All in milliseconds. Now, Wi-Fi has gone through a lot of upgrades over the years. You might have seen names like Wi-Fi 5, Wi-Fi 6, or Wi-Fi 6E. Right now, Wi-Fi 7 is the latest version. On paper, it can handle speeds over 40 gigabits per second. That's absurdly fast. But in your actual house? You're getting a fraction of that. Probably 200 to 500 megabits per second, if you're lucky. Why the huge gap? Because real life gets in the way. Walls weaken the signal. Distance weakens the signal. Other devices on the same network slow things down. Your neighbor's Wi-Fi can even interfere with yours if you're on the same channel. The more stuff between you and the router, the worse the experience. One thing a lot of people don't know, Wi-Fi uses different frequency bands. 2.4 gigahertz is the older one. It travels farther, but it's slower and more crowded because almost everything uses it. Your microwave, your baby monitor, your neighbor's router. 5 gigahertz is faster but doesn't travel as far and struggles with walls. The newest band, 6 gigahertz, available on Wi-Fi 6E and Wi-Fi 7, gives you the most speed and the least congestion. But your device has to support it. Despite all of that, for the vast majority of people, Wi-Fi works great. Streaming Netflix, scrolling social media, video calls with your family, Wi-Fi handles all of it. The only time it becomes a real problem is when you need a connection that never drops, like competitive gaming or a 4-hour live stream. That's when people start looking at the next one. One quick tip though, most Wi-Fi problems aren't about the technology, they're about router placement. If your router is shoved in a closet or sitting on the floor behind your TV, your signal is already fighting to get out. Put it in a central spot, up high, out in the open. That alone fixes more Wi-Fi complaints than upgrading to a fancier router ever does. Ethernet Ethernet is the simple answer to every Wi-Fi problem. It's a cable. You plug one end into your computer. The other end goes into your router or a network switch. Done. You now have a direct wired connection to the internet. No radio waves, no interference, no fighting with 20 other devices for bandwidth. Just a clean, stable pipe from your device to the network. That's why Ethernet connections are almost always faster and more reliable than Wi-Fi. The signal doesn't degrade because you're in the wrong room. It doesn't drop because your Cat5e, the most common one you'll find lying around, handles up to 1 Gbps. Cat6 handles 10 Gbps over short runs. Cat6a does 10 Gbps over longer distances. Cat7 and Cat8 exist too, but unless you're setting up a data center, you probably don't need them. For home use, Cat5e or Cat6 is more than enough. Gamers know this already. That's why most serious gaming setups have an Ethernet cable running to the PC or console. Streamers know this too. Anyone who has ever lost a Wi-Fi connection during a live broadcast learns this lesson once and never goes wireless again. Video editors downloading huge project files? Ethernet. Remote workers on all-day video calls? Ethernet. And it's not just about download speed. Ethernet gives you lower latency and virtually zero packet loss. That means in an online game, the time between you pressing a button and the server receiving that input is shorter and more consistent. On Wi-Fi, that timing fluctuates. On Ethernet, it doesn't. That tiny difference doesn't matter for watching YouTube. But in a competitive match, it matters a lot. The only downside is convenience. You need a physical cable. You can't just walk around the house with your phone plugged into a cable. That's obviously not practical. But for anything that sits in one place, your desktop, your console, your TV, your work computer, there's really no reason not to use Ethernet. A Cat5e cable costs a few dollars. Plug it in, and the difference is instant. Seriously. Most people who try it wonder why they didn't do it years ago. Fiber-optic Okay, this is where things get fast. Really fast. Fiber-optic technology doesn't use electricity to move data. It uses light. Actual light. Inside a fiber-optic cable, there are incredibly thin strands of glass. Thinner than a human hair. And data travels through them as pulses of light. And because light moves at, well, the speed of light, fiber connections are on a completely different level. We're talking 1 gbit per second, 10 gbit per second, sometimes 100 gbit per second for commercial setups. Even the basic fiber plan most providers offer is already faster than what most copper-based connections can ever reach. But speed isn't the only advantage. Fiber also doesn't care about electromagnetic interference. If you run a copper cable next to a power line, you can get signal issues. Fiber doesn't have that problem. Light inside glass doesn't get affected by anything electrical happening nearby. That also means fiber can carry data over much longer distances without losing signal strength. Which is why the backbone of the entire internet, the massive data highways between cities and across oceans, is almost all fiber. There are actually two types of fiber you might encounter. Single-mode fiber uses a very narrow glass core and sends light in a single straight path. It can carry data over extremely long distances, hundreds of kilometers, without losing much signal. That's what internet providers and telecoms use for the long haul. Multi-mode fiber has a wider core and sends light in multiple paths at once. It's cheaper and used for shorter distances, like inside office buildings or data centers. Some homes and apartments now get what's called fiber to the home. That means the fiber cable comes all the way from the provider directly into your house. If you have that option where you live, take it. That's genuinely the best internet connection available to regular consumers right now. The catch? Installing fiber is expensive. We're talking about digging up streets and laying down glass cables underground. That's why a lot of neighborhoods, especially outside big cities, still don't have it. It's expanding, but slowly. And depending on where you live, it might be years before fiber reaches your area. But when it does, you won't find anything faster or more reliable coming into your house. Coaxial cable. That thick cable with the screw-on connector that used to go into the back of your TV? That's coaxial. You might still have one plugged in right now. Cable companies originally built coaxial networks to deliver TV signals into people's homes. Then, once the internet became a thing, they realized they could push internet data through those same cables. And it works. Newer systems use a standard called DOCSIS 3.1, which can deliver speeds up to about 1 gbit per second. That's plenty fast for most households. DOCSIS 4.0 is pushing even higher, up to 10 gbit per second in theory. But here's the thing most people don't realize. Coaxial internet is shared bandwidth. You and your neighbors are all on the same cable line coming from the same local node. So if everyone on your block starts streaming at 8 pm, the total capacity gets split between all of you. Your speed drops. Not dramatically most of the time, but it's a real thing. You might be paying for 500 megabits per same and only getting 200 megabits per sames during peak hours. Fiber doesn't have this problem because each home gets its own dedicated line. The other issue is upload speed. Cable internet has always been heavily tilted toward download. Your download might be 500 megabits per second, but your upload could be 20 megabits per second. That wasn't a big deal when people mostly consumed content. But now, with video calls, live streaming, uploading large files to the cloud, that upload bottleneck is starting to matter more. Coaxial was the standard for home internet for a long time. It still is in a lot of places. But wherever fiber shows up, Coaxial starts to feel like the older option it is. Powerline networking. Every house has that one room where Wi-Fi just refuses to work. The signal dies before it gets there. Maybe it's through too many walls. Maybe it's in the basement. Maybe it's on the opposite end of the house from the router. We all know the room. Powerline networking is a clever workaround. It turns your home's existing electrical wiring into a data network. You buy a pair of adapters. You plug one into a wall outlet near your router and connect them with a short ethernet cable. Then you plug the second adapter into an outlet in the dead zone room. Data travels between the two through the electrical wires in your walls. Does it work? Yeah, actually. Most Powerline adapters advertise speeds of 500 megabits per second to 2 gigabits per second on the box. In reality, you'll probably get 50 to 150 megabits per second, depending on your wiring, the distance between the two adapters, and whether they're on the same electrical circuit. That's a lot slower than real ethernet. But it's way more stable than trying to catch a dying Wi-Fi signal through three concrete walls. Most people use it as a band-aid solution. And for that purpose, it's pretty effective. Just don't plug the adapters into power strips or surge protectors. That kills the signal. Plug directly into the wall outlet. DSL. DSL stands for Digital Subscriber Line. And for a long time, this was how most of the world connected to the internet. It uses regular old telephone lines, the copper ones that carried landline phone calls, to deliver internet data. The appeal back then was obvious. Almost every home in every developed country already had a phone line installed. So internet providers didn't need to build new infrastructure. They just used what was already there. The problem was always speed. Early DSL connections gave you maybe 1 to 10 megabits per second. At the time, that felt fast enough. But by today's standards, it's painfully slow. There are different types too. ADCL gives you faster download than upload, which is fine for browsing. SDL gives you equal speeds both ways, which is better for business use. And VDSL's, the more modern version, tops out around 100 megabits under perfect conditions. But perfect conditions means you live close to the provider's central office. The farther away you are, the weaker and slower the signal gets. Some people on DSL lived just a couple of kilometers too far and got speeds that felt like dial-up. DSL still exists. You can still get it in areas where cable and fiber haven't arrived yet, especially in rural regions. But honestly, if you have literally any other option available, cable, fiber, even a decent cellular connection, DSL is the last choice for a reason. Cellular networking. Every time you step outside your house and open Instagram, watch a YouTube video on the bus, or send a message while walking down the street, you're using cellular networking. Your phone sends data to a nearby cell tower using radio waves. That tower is connected to the internet. The data goes out, comes back, and arrives on your screen. That's the basic idea. The interesting part is how much this technology has changed in just a couple of decades. Each generation brought a massive leap. 2G lets you send text messages and make calls. 3G made it possible to browse the web on your phone. Slowly and painfully, but possible. 4G changed everything. Suddenly you could stream HD video, video call, and basically do anything on your phone that you could do at home. Then came 5G, and this is where things get complicated. Because when your carrier says 5G, they could mean three very different things. Low-band 5G covers a huge area. It reaches far and works indoors. But the speed? Barely faster than good 4G. Most people on low-band 5G can't actually tell the difference. Mid-band 5G is the sweet spot. Noticeably faster speeds, reasonable coverage, good enough for most real-world use. Then there's MMWave, which is the headline-grabbing version. This is the one that delivers multi-gigabit speeds, but it can barely go through a window, let alone a wall. You need direct line of sight to the tower, and even a tree can block it. So when someone says, I have 5G, the experience can range from slightly better 4G to faster than most people's home internet. It depends entirely on which type they're connected to and how close the tower is. There's another thing worth knowing. Some carriers now offer 5G home internet, basically using the cellular network as your home connection instead of cable or fiber. For people in areas with good mid-band 5G coverage, it actually works. Speeds around 100 to 300 megabits per second. No cable installation needed. It's not perfect. Speeds vary by time of day and tower congestion. But it's a real alternative for people who don't have great wired options. For most people around the world, though, 4G LTE is still doing the heavy lifting every single day. 5G will get there eventually. The infrastructure is expanding. But right now, the real-world experience hasn't caught up to the marketing. And if your carrier says, nationwide 5G, they almost certainly mean the slow kind. Satellite internet. Imagine you live in a place with no cable lines, no fiber, no cell tower within reach. You're hours from the nearest city. How do you get internet? You point a dish at the sky. Satellite internet works by sending data from your dish to a satellite orbiting Earth, then back down to a ground station connected to the internet. That ground station sends the data you requested back up to the satellite. And the satellite beams it down to your dish. It's a round trip through space. Literally. Old satellite internet was rough. The satellites were in geostationary orbit, about 36,000 kilometers above the surface. That distance meant latency of 600 milliseconds or more. Every click, every page load, you could feel the delay. Gaming was basically impossible. Video calls stuttered. It technically worked, but barely. Then companies like Starlink changed the game. They launched thousands of satellites in low-Earth orbit, about 550 kilometers up, instead of 36,000. That cut latency down to around 20 to 40 milliseconds. That's actually usable. You can video call on it. You can game on it. Speeds improved, too, often reaching 100 to 300 megabits per second. And because there are thousands of satellites working together, coverage keeps expanding to more and more areas around the world. It's still not as fast or consistent as fiber. Bad weather can affect the signal. And the monthly cost is usually higher than ground-based options. But for people in remote areas who had no real alternative, satellite went from barely functional to genuinely decent. That's a huge deal for millions of people. Bluetooth. Your wireless earbuds. Your game controller. Your smartwatch. Your keyboard. The speaker in your shower. The fitness tracker on your wrist. All Bluetooth. Bluetooth is a short-range wireless technology, designed for one simple purpose. Letting nearby devices talk to each other. Not to the internet. Just to each other. Your earbuds talk to your phone. Your mouse talks to your laptop. Your phone talks to your car's stereo system. That's Bluetooth. It works over radio frequencies, usually within a range of about 10 meters. Some newer devices can push that a bit farther. But Bluetooth was never meant for long distances. It's built for personal, close-range, low-power connections. The current version is Bluetooth 5.4. Each version has improved speed, range, and efficiency. But the core idea hasn't changed. It's still about connecting personal devices with minimal battery drain. And that battery part is really important. Your earbuds run on a tiny battery. They need to stream audio for five, six, sometimes eight hours on a single charge. Bluetooth makes that possible because it sips power instead of guzzling it. One thing most people don't know. Bluetooth actually has different profiles and modes for different jobs. A2DP is the profile that handles music streaming. HID handles input devices like keyboards and mice. And Bluetooth Low Energy, or BLE, is a completely separate mode designed for devices that need to stay connected for days or even weeks without recharging, like fitness trackers and smartwatches. Everyone uses Bluetooth every single day. It's one of those technologies that works so well in the background that most people never think about it until it doesn't connect properly. And then suddenly, it's the most frustrating thing in the world. NFC. You walk into a store. You hold your phone near the payment terminal. It beeps. You just paid. That entire transaction happened over NFC, near-field communication. NFC works from about four centimeters away. That's not a limitation. That's the whole point. The extremely short range is what makes it secure. A hacker sitting across the room can't intercept your NFC payment because the signal simply doesn't travel that far. Your device has to be basically touching the reader for anything to happen. You've been using NFC more than you probably realize. Contactless credit cards use NFC. Transit cards in most major cities use NFC. Hotel room keys that you hold against the door lock use NFC. When you tap two phones together to share a contact or a photo, that's NFC starting the connection. Even those smart tags you can buy, like Apple AirTag or Samsung SmartTag, use NFC for part of their setup process. The technology behind it is surprisingly simple. One device generates a small electromagnetic field. When another NFC device enters that field, within about four centimeters, they exchange data. The whole interaction takes less than a second. No pairing. No passwords. No waiting for a connection to establish. That simplicity is what makes it so useful for everyday things like payments. You tap. It works. You move on. NFC doesn't transfer large amounts of data. It's not meant to. It's built for fast, simple, secure, one-tap interactions. Think of it as a handshake. Quick, close, and done in a second. Infrared. Here's a throwback. Remember pointing your TV remote at the television and pressing the button, and nothing happening because you weren't aiming it right? That was infrared. It sends data using invisible light, a beam that travels in a straight line from the remote to a tiny sensor on the TV. Infrared was everywhere in the 90s and early 2000s. Some early phones even had infrared ports so you could transfer contacts and files by pointing two phones at each other. Remember that? It felt like magic at the time. But infrared has some serious limitations. It needs a clear line of sight. Any obstacle blocks the signal. The range is short. The speed is low. And it can only connect two devices at a time, pointed directly at each other. Once Wi-Fi and Bluetooth came along and did everything better, infrared faded out of almost every device. Today, it still lives inside TV remotes and some industrial sensors. But that's about it. Infrared did its job for a generation. Then better technologies showed up and it retired. Zigbee. Now we're entering the smart home world. Zigbee is a wireless protocol designed specifically for small, simple devices. Smart light bulbs, motion sensors, door sensors, thermostats, smart plugs. These devices don't need to download files or stream video. They just need to send tiny bits of data. Things like motion detected, temperature is 72 degrees, or turn the light off. Zigbee is built to do exactly that. Move tiny messages using very little energy. A Zigbee device can run on a single coin cell battery for over a year. Sometimes two years. That's a big deal when you have 20 sensors scattered around your house and you don't want to change batteries every month. Zigbee also creates what's called a mesh network. Each device can relay signals to other nearby devices. So if a sensor in your backyard can't reach the hub directly, it can bounce the signal through the smart plug in your kitchen. More devices actually makes the network stronger and more reliable. You might have also heard of a newer standard called MATTER, which is trying to unify smart home protocols. MATTER actually runs on top of Thread, which is built on similar technology as Zigbee. So even if Zigbee itself eventually gets replaced, the ideas behind it are carrying forward into the next generation of smart home tech. The trade-off is speed. Zigbee maxes out at about 250 kbit per sec. That's incredibly slow by internet standards. But for a light switch that only needs to send on or off, it's more than enough. You'd never stream a video over Zigbee. That's not what it's for. Z-Wave does almost exactly the same thing as Zigbee. Low power, short range, mesh networking for smart home devices. So why do both exist? The main difference is the radio frequency. Zigbee operates on 2.4 gigahertz, which is the same band as your Wi-Fi and Bluetooth. That means they can interfere with each other in crowded environments. Z-Wave uses a different, less crowded frequency, usually around 900 megahertz depending on your country. Less traffic on that band means less interference. Z-Wave is also a proprietary standard, which means every Z-Wave device has to go through a certification process. The benefit is compatibility. Z-Wave devices from different manufacturers are guaranteed to work together. Zigbee is more open, which means there are more devices available. But sometimes they don't play nice with each other, depending on which version of Zigbee they support. If you're building a smart home, both work well. Z-Wave tends to be more consistent and predictable. Zigbee gives you more choices and is usually a bit cheaper. Honestly, pick whichever one has the devices you want and stick with it. Mixing both in the same house works, but it means running two separate mesh networks, which adds complexity. LoRa and LoRaWAN Every networking technology we've talked about so far cares about speed. LoRa does not. LoRa, which stands for long range, is designed to do one very specific thing, send extremely small amounts of data over very long distances using almost no power. How long is long range? In open areas, a single LoRa transmission can travel up to 15 kilometers. In cities, with buildings in the way, it's more like 2 to 5 kilometers. Still impressive for a technology that runs on a coin cell battery. LoRaWAN is the network protocol built on top of LoRa. It handles how devices connect to gateways and how data gets routed to the internet. A single LoRaWAN gateway can serve thousands of sensors. That makes it incredibly efficient for large-scale deployments. So where is this actually used? Agriculture, sensors monitoring soil moisture, temperature, and humidity across massive fields. Smart cities, tracking air quality, water levels, parking space availability, industrial monitoring, keeping tabs on equipment in remote locations where running cables or using cellular would be too expensive or impractical. Imagine a vineyard with 500 sensors spread across hundreds of acres. Each sensor checks soil moisture once an hour and sends a tiny packet, maybe 50 bytes, back to a gateway. That gateway sends everything to a server. The farmer checks a dashboard. Done. No cell plan for each sensor. No Wi-Fi infrastructure in the middle of a field. Just LoRa doing exactly what it was designed for. These are all devices that send one tiny reading. Maybe once an hour. Maybe once a day. They don't need speed. They need range and battery life. And that's exactly what LoRa delivers. You'd never browse the web over LoRa. You'd never stream anything. That's completely not the point. Mesh networking. If you live in a small apartment, one router probably covers every corner just fine. But if your house is bigger, two floors, long hallways, thick walls, you already know the pain. The Wi-Fi works great in the living room and dies in the bedroom. You move to the kitchen and it comes back. Walk to the garage and it's gone again. Mesh networking fixes this problem in the simplest way possible. Instead of one router trying to cover everything, you place multiple nodes, usually two or three, around your house. Each node is basically a mini-router and they all communicate with each other to create one single seamless network. The key word is seamless. With a traditional setup, if you bought a second router or a range extender, you'd often end up with two separate networks. One near the main router. One near the extender. Your phone would cling to the weaker one as you walked between rooms. You'd have to manually switch. It was annoying. Mesh systems don't have that problem. Every node shares the same network name. Your device automatically connects to whichever node has the strongest signal as you move around the house. You don't notice the handoff. It just works. Popular mesh systems include Google Nest Wi-Fi, Amazon Eero, TP-Link Deco, and a few others. They're all easy to set up. Most of them use a phone app that walks you through the whole thing in about 10 minutes. One thing to look for when buying a mesh system, the backhaul. That's how the nodes talk to each other. Some systems use a dedicated wireless band just for node-to-node communication, so it doesn't eat into the bandwidth you're actually using. Others share the same bands with your devices, which means the more nodes you add, the more your overall speed can dip. The best systems use a dedicated backhaul band or even let you connect nodes with ethernet cables for maximum speed between them. The downside is price. A three-pack mesh system costs a lot more than a single router, and every hop between nodes adds a tiny bit of latency, though most people won't notice that in daily use. But for large homes, offices, or any space where a single router just can't cover everything, mesh is the best solution we have right now. And honestly, once you've used one, going back to a single router feels broken. Lifey Last one, and this one sounds like something from a science fiction movie, but it's real. Lifey sends data using visible light. You know how your LED bulb flickers? Actually, you don't know, because it flickers so fast that your eyes can't detect it. But a special receiver can read those flickers as data. On and off, on and off, millions of times per second. To your eyes, it's just normal light. But to the receiver, it's basically a stream of digital information. That's Lifey. In lab conditions, Lifey has hit speeds over 200 gigabits per second. That blows normal Wi-Fi speeds out of the water. And because light can't pass through walls, the connection is naturally more contained. Someone in the next room, or the next building, can't simply intercept the same light signal through the wall. But that's also the biggest limitation. You need access to the light source. Walk behind a wall, disconnected, block the light completely, and the connection can disappear. It's the opposite of Wi-Fi's greatest strength, which is that radio waves can travel through walls and around obstacles. Right now, Lifey is still pretty niche, and mostly used in specialized environments. Commercial products do exist, but they're nowhere near as common or convenient as Wi-Fi. Still, Lifey could make sense in places where speed, security, or avoiding radio interference really matters, like hospitals, aircraft, research labs, or high-security offices. It probably won't replace Wi-Fi. Instead, the two could work together. Wi-Fi could cover the whole building, while Lifey provides extremely fast connections in specific rooms. And if that happens, your ceiling light could literally become part of your internet connection. That's kind of wild to think about. Anyway, that covers every major networking technology out there, from the Wi-Fi in your room, to cellular towers across entire cities, satellites thousands of kilometers above Earth, and even the LED bulb that might become your internet connection in the future. And the crazy thing is, most of these technologies are working around us every single day without us even noticing. Every time you send a message, open a website, stream a video, or connect a new device, there's an entire network working behind the scenes to make it happen. Some of these technologies have been around for decades, others are still experimental, and a few of them could completely change how we connect in the future. So yeah, networking is a lot bigger than just Wi-Fi and Ethernet. I also made some other cool videos explaining technology like this, so if you enjoyed this one, don't forget to check those out too. There's probably something there you've always used but never really understood. Anyway, that's it for this one. Thanks for watching, and I'll see you in the next video. Okay.