+An **overlay network** is a virtual network layered upon an existing one, like a hidden path over familiar roads. Its nodes, connected by software, communicate without direct knowledge of the underlying [Physical Network](/wiki/physical_network) or [Routing](/wiki/routing) complexities. This abstraction allows for new network architectures and services to be built efficiently.
+## See also
+- [Virtual Network](/wiki/virtual_network)
+- [Peer-to-Peer](/wiki/peer-to-peer)
+- [VPN](/wiki/vpn)
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