Bridging and Routing are both ways of performing data control, but work through different methods. Bridging takes place at OSI Model Layer 2 (Data-Link Layer) while Routing takes place at the OSI Model Layer 3 (Network Layer). This difference means that a bridge directs frames according to hardware assigned MAC addresses while a router makes its decisions according to arbitrarily assigned IP Addresses. As a result of this, bridges are not concerned with and are unable to distinguish networks while routers can. source
Other good sources of infomation: this or this or this.
Good Luck!
-Flame
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A bridge works at layer 2 of the OSI model. A router works at layer 3. You will typically see a bridging router (brouter) in use most of the time. See this wikipedia article for more information.

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