Ethernet is a networking technology that is used to connect devices in a local area network (LAN). It is a set of rules and standards that define how data is transmitted over a wired connection. Ethernet uses a technique called carrier sense multiple access with collision detection (CSMA/CD) to manage the flow of data.

An example of Ethernet in use would be a group of computers in an office building that are connected to a single network. Each computer has an Ethernet network interface card (NIC) that is connected to a central hub or switch. The computers can communicate with each other and share resources, such as printers and files, as if they were all connected to the same computer.