A computer virus is a awful affairs which can accumulate itself and advance it beyond computers. bacilli can sometimes be controllable but just irritating, and can alter to the admeasurement of getting baleful for your computer. although theories about computer bacilli accept been talked about back the 1940s, a computer virus was aboriginal spotted in the aboriginal 1970s. the basal acknowledgment to the catechism of what is a computer virus is that it is a affairs which multiplies itself, just like a absolute activity virus does. adopted bacilli : adopted bacilli absorb the infection of a array of `search and attack` mechanism, area two modules plan calm to affect files, one searches and one infects. citizen bacilli : citizen bacilli affect the anamnesis of the computer and they are exectuted everytime an accident is alleged upon, it can affect a lot of files at one time