VLAN- Virtual Local Area Network. VLAN is a Custom Network composed of One or More LAN.

VLAN(Virtual Local Area Network)A Network administrator/Network Manager can use a VLAN for Logically sub dividing a LAN in to different broadcast domains. It allows a group of devices in multiple networks to combine into one Logical Network. When users moves there works stations,administrators don't need to reconfigure the network or change VLAN groups.