It usually takes sometime for an organization to evolve to the point at which it needs large open systems or,at least,cooperative computer systems made up of pieces supplied by many vendors.The need of connectivity often begins with a simple desire to share a single printer between two PC's or to move a file from one person to another without writing it to a disk and walking it down the hall.Today the need to share expensive links to the internet or to corporate intranets drives the shape of many local area networks.

•             A "NETWORK" is an type of interactive information-carrying system.
• Your body contains networks of sensors and nerve fibers,andyour television set displays information from entertainment networks.