Worm

A worm is a program, originally developed by systems programmers, which allows the user to tap unused network resources to run large computer programs. The worm would search the network for idle computing resources and use them to execute a program in small segments. Built-in mechanisms would be responsible for maintaining the worm, the worm, nding free machines, and replicating the program. Worms can tie up all the computing resources on a network and essentially shut it down. A worm is normally activated every time the system is booted up.