A local area network (LAN) is a computer network covering a small physical
area, like a home, office, or small group of buildings, such as a school, or an airport. The defining characteristics of LANs, in contrast to wide-area networks (WANs), include their usually higher data-transfer rates, smaller geographic range, and lack of a need for leased telecommunication lines.
Metropolitan area networks, or MANs, are large computer networksOptical fiber connections to link their sites. usually spanning a city.