Can someone explain me the difference between those three devices?
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Internet arrives at your home through either copper coaxial cable or optical fiber. Hub connects to this and it has some ethernet ports on the back so you can connect your computer to it, it also can broadcast a wifi signal so you can connect to it wirelessly. For most people this is all you need.
If your hub doesnt have enough ethernet ports for your needs you can have more by connecting a network switch to it via an ethernet cable.
If the wifi signal on your hub is crappy you can turn off the wifi on the hub and connect a router to it and use the router to broadcast a wifi signal. You could also leave the wifi on the hub on if you’d like but then the two wifi signals may interfere with each other if they are too close together, so maybe place the router somewhere far away. that way your home’s wifi will have a farther range.
The router also has extra ethernet ports on it so it also acts like a switch.
The hub you usually get with your internet provider is typically really crap and its often suggested to buy your own good quality router.
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