Local Area Network (LAN) is network that covers area such as a building or group of buildings.
A LAN is built by ethernet cable.
A LAN has a server which is connected to other computers and devices through a device known as hub.
A hub is hardware networking device which connects various computers and computer devices on network through port.
Computers in office building or a school or campus is generally connected through LAN.
A LAN can cover an area over a kilometer.