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A LAN, or Local Area Network, is a computer network that connects devices within a small, confined physical area like a home, office, or building. It allows computers and other devices to share resources such as files, printers, and internet access.

Location: The key defining feature of a LAN is that it operates in a limited geographical area, distinguishing it from a Wide Area Network (WAN).

Connectivity: Devices within a LAN are connected through a common communications line or a wireless connection. Common technologies used include Ethernet cables or Wi-Fi.

Purpose: The primary purpose is resource sharing, which allows multiple users to access shared resources like printers or servers, and to exchange information quickly.

Size: A LAN can be small, connecting just a few devices in a home, or it can be large, connecting thousands of devices in a large office building or campus.