As an alternative to slower, phone-based Internet connections, users can take advantage of a high-speed, broadband connection using Ethernet cables. In order to connect your laptop computer to an Ethernet cable, the computer must have an Ethernet port built into it. The Ethernet cable is used to connect to a modem or router that provides your PC with access to the Internet. You must contact your local Internet service provider (ISP) to set up a subscription before you can access the Internet through a modem or router.