A Wabbit, Rabbit or Computer Bacterium is a type of self-replicating computer program. Unlike viruses, wabbits do not infect host programs or documents. Unlike worms, wabbits do not use network capabilities of computers to spread. Instead, a wabbit repeatedly replicates itself on a local computer. Wabbits can be programmed to have (malicious) side effects.  An example of a wabbit is a fork bomb.