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Slimebeast said:

Most people I know of use routers to connect many devices in their home. I get my internet through a physical cable, one device at a time. I had a router in the past but the connections were very unstable.

Sometimes I have relatives over in my house and they ask if we have Wi-fi or something to connect their smartphones and iPads. I don't know how that works. Is that through a router too?

Ahh gotcha. My modem has in built router which is supplied by the internet provider. You can get a router and connect it to modem to have wireless internet all over your house. You spend too much time in medieval times Slimebeast. Welcome to wifi's. Rumoured side effects include low sperm count though.