A LAN (Local Area Network) is a network that connects computers, servers, and other devices within a limited geographic area, such as an office, school, or building. LANs enable devices to share resources, such as files, printers, and internet connections, efficiently and securely. They typically use wired connections (like Ethernet cables) or wireless technologies (such as Wi-Fi). LANs are fundamental to business and organizational IT infrastructure, allowing for fast data transfer and centralized management. Security measures, such as firewalls and access controls, are commonly implemented to protect LANs from unauthorized access and cyber threats.