Mapping a network drive provides a quick way to access the information on another computer on the network. You can share information just like it was on your own computer. If you frequently use information stored on another computer, mapping can save you time. Windows simplifies the process by assigning a letter to specify the location of the mapped drive. You can have access to a mapped drive each time you log on to the network.
Below are links on mapping a drive for different versions of Windows.