The interconnection of computers for the purpose of sharing files, programs and various devices such as work stations, printers and high-speed modems. LANs may include dedicated computers or file servers that provide a centralized source of shared files and programs. Most office computer networks use a LAN to share files, printers, modems and other items. Where computers are separated by greater distances, a Metropolitan Area Network (MAN) or other Wide Area Network (WAN) may be used.