If you've purchased cable internet service, find a cable port in your house to connect the modem to. If you've purchased DSL ...
A device used to connect a single computer or a network to a telephone company digital subscriber line (DSL) service for Internet access. DSL is faster than analog dial-up but significantly slower ...
Both devices also include a router and an Ethernet switch to connect (typically four) computers by wire. A "wireless gateway" is a cable or DSL gateway that includes a Wi-Fi access point.