Ethernet is a local area network (LAN) standard that enables computers to communicate with one another over a variety of cables. It transmits data at 10 Mbit/s and other versions, such as Fast Ethernet and Gigabit Ethernet, can transmit data at higher speeds up to 10 Gigabit Ethernet. It uses Carrier Sense Multiple Access with Collision Detection (CSMA/CD) as the access method.

Ethernet cables come in various types, including coaxial cable, unshielded twisted pair (UTP) cable, and optical fiber. Coaxial cables are the most common type of Ethernet cable and consist of a single core wire surrounded by insulation and a metal shielding layer. UTP cables are smaller than coaxial cables and are used for short-distance connections. They consist of two insulated copper wires twisted together and encased in a plastic sheath. Optical fiber cables are composed of a long fiber-optic cable that transmits data using light signals.

Each Ethernet cable type has its own specific use. Coaxial cables are used for larger networks such as in a large office building or university. UTP cables are used for small networks such as in a home or small office. Optical fiber cables are used for long-distance connections such as between two buildings.

Ethernet is the most widely used LAN standard in the world and is an essential part of the network infrastructure. It is used to connect computers, printers, and other devices together in a local area network. It is also used to connect to the internet, allowing users to access the web, send and receive emails, and more.