A VLAN, or Virtual Local Area Network, is a networking technology that allows virtual separation of a physical network into multiple virtual networks. While not used so much in home networks, VLANs are often used in large business and enterprise networks where it’s beneficial to segment a large network into multiple smaller virtual networks.

    One example of where this would be beneficial is to separate departments within a company. As it may not be necessary to give sales access to engineering and vice versa, using VLANs would allow each of them to utilize a common infrastructure, but be separated as if they were on physically separate switches and routers.