Ethernet is the most common local area networking technology, and, with gigabit and 10 gigabit Ethernet, is also being used for metropolitan-area and wide-area networking.

It is specified by [http://standards.ieee.org/getieee802/802.3.html various IEEE 802.3 specifications].

A lot of tutorial information about Ethernet can be found at [http://www.ethermanage.com/ethernet/ethernet.html Charles Spurgeon's Ethernet Web Site].