A local area network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, university campus or office building. It is in contrast to a WAN (wide area network) which typically interconnects to the internet. Groups of machines that are only connected to a LAN, or not connected to a network at all, are often called “Dark Sites” or “Air Gapped” environments.

See also Dark Site and Air Gap