It's used for cable television and cable internet (which is most high-speed internet in the US). Generally you don't have to think about it too much: you'll hav

It's used for cable television and cable internet (which is most high-speed internet in the US). Generally you don't have to think about it too much: you'll have a coax jack in the wall and then you connect it to your TV and/or cable modem and then leave it alone, but yes.