Ethernet is the most used networking technology for LANs today. It defines wiring and signaling for the Physical layer of the OSI model. Also, for the Data Link layer, it defines frame formats and protocols.
It is described as IEEE 802.3 standard. It uses Carrier Sense Multiple Access with Collision Detection (CSMA/CD) access method and also supports speeds up to 100 Gbps. It can also use coaxial, twisted pair and fiber optic cables. It uses frames to with source and destination MAC addresses to deliver data.
The term Ethernet LAN refers to a combination of computers, switches, and different kinds of cables that use the Ethernet standard to communicate over the network. It is also by far the most popular LAN technology today.