An Ethernet cable is a common type of network cable used with wired networks. Ethernet cables connect devices such as PCs, routers, and switches within a local area network. The simplest way to select a cable is to pick the one with the range and performance you need. Various cables are used for carrying Ethernet: current common types include Cat 5, 5e, Cat 6, 6a, 7 and Cat 8 and the RJ45 connector is widely used.