An Ethernet cable is a type of network cable used to connect devices like computers, routers, and switches in a local area network (LAN). It allows for high-speed data transmission, enabling devices to communicate with each other and access the internet. These cables come in various categories, such as Cat5e, Cat6, and Cat7, each offering different speeds and bandwidth capabilities. Typically, an Ethernet cable has eight wires twisted together in pairs, which helps reduce interference and maintain a stable connection.