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A Metropolitan Area Network (MAN) is a computer network that is larger than a single building Local Area Network (LAN) but is located in a single geographic area that is smaller than a Wide Area Network (WAN). Generally, it is several LANs interconnected by dedicated backbone connections. It may also refer to public use networking infrastructure in a municipality or region.

Source: https://www.techtarget.com/searchnetworking/definition/metropolitan-area-network-MAN