A local area network (LAN) that is logically (virtually) setup through one or more data networks that independently managed. VLAN connections are setup to allow data to safely and privately pass over other types of data networks (such as the Internet).
A VLAN is a group of devices on one or more LANs that are configured to communicate as if they were attached to the same wire, when in fact they are located on a number of different LAN segments. Because VLANs are based on logical instead of physical connections, they are extremely flexible. Multiple VLAN's can reside on a single piece of Ethernet cable. This allows for multiple networks to coexist with minimal infrastructure.
VLANs define broadcast domains in a Layer 2 network. Traffic cannot pass directly to another VLAN within the switch or between two switches. To interconnect two different VLANs, you must use routers or Layer 3 switches.
There are many more Benefits of VLANs
