Wikimedia
Wikipedia: Local Area Network (Lan)
Wikipedia provides an encyclopedia definition of a local area network, or LAN, including many hyperlinked terms.
Tech Target
Search Networking: Local Area Network
A simple definition of the term, "Local Area Network," or "LAN" including hyperlinked terms.
Other
Webopedia.com: Local Area Networks
This site from Webopedia.com provides definition and uses of Local Area Networks. Includes LAN characteristics with linked definitions. Has many links to related sites.