Wait wait......lets not forget what a bridge is fellers.
If you are speaking of a wireless device, like a wireless gateway/router or a wireless access point, then placing this wireless device into "Bridge Mode" will allow you to connect two wired networks by using two (or more) of these wireless deivces. One on each end of the the wired network. Consider the attachment.
In bridge mode.....it's just a device that extends a wired oir another wireless network.
-Mike