Virtual LAN (VLAN) What is a Virtual LAN (VLAN)? A Virtual LAN (VLAN) is a logical grouping of devices on a network, enabling them to communicate as if they were on the same physical network, regardless of their actual locations. Explanation VLANs improve network segmentation, security, and efficiency by isolating traffic and reducing congestion. They are commonly used in large networks to separate different departments or user groups. Practical Example of a VLAN An organisation creates VLANs to separate traffic for its HR and IT departments, ensuring better security and network performance.