Bridge

A Bridge is a networking device which connects multiple LANs and forwards or filters data packets between them based on their destination address. Bridges operate at the data link (level 2) of the OSI model.
Bridges are most frequently used to connect LAN segments to other LAN segments or to a wide area network (WAN). Bridges are protocol independent, you could connect an Ethernet network with a Token Ring network using a bridge. Typically though, they are used to connect two similar networks together.