Network bridging provides an easy way to connect 2 or more network to become a single big network without using router in order to share file, printer or Internet connection. Please note that all computers in different network that needs to be bridged must sit in same logical IP network.
Windows XP does provide the software bridging to bridge different network, so you don’t have to purchase hardware bridge for doing it. You cannot create a bridge connection on a computer running Windows 2000 or earlier versions of Windows. Please note also only one network bridge can be created on a computer.
As an example, this is my home network with 2 network, one is Ethernet network and the other one is wireless network. You can do network bridging on a computer that have physical connection to both network, so that they will become one big network.