An ethernet cable, also known as a network cable, is used to connect electronic devices, such as computers, routers, switches and other networking equipment. It is designed to transmit data between devices over a wired network. Ethernet cables come in different categories, such as Cat5, Cat6 and Cat7, each with varying levels of speed and performance. The cables typically have a rectangular-shaped plug on either end that fits into an ethernet port on the device. Ethernet cables are commonly used in home and office networks to provide reliable and fast internet connections, as well as to connect devices for file sharing or other purposes.