A LAN refers to a Local Area Network, which is a network that connects computers and devices within a limited geographical area, such as a home, office, or building. It allows for the sharing of resources, such as files and printers, and enables communication between devices within the network. The other options, such as Long Area Network, Ludacris Area Network, Live Area Network, and Loaded Area Network, do not exist or have any relevance in the context of computer networking.