Computer Virus

Computer Virus

Computer virus is a parasitic program written intentionally to enter a computer without the user's permission or knowledge. The word parasitic is used because a virus is attached to files or boot sectors and is replicated itself thus continuing to spread. Though some viruses do a little damage but replicate, others can cause serious damage or affect a program and system performance.
Basically, a computer virus is a special kind of computer program, which spreads across disks and networks by making copies of itself, usually secretly and can produce undesired side-effects in computers in which it is active,