The virus in some way feeds on human cells - and in much the same way, the harmful computer program: it captures and 'eats' files, fitting into them program code. It is known that a person most often gets sick under the influence of viruses - this kind of infection affects a specific organ or system and weakens the body, affecting its cells. What does an infected computer have in common with a sick person? Knowledge of the features of various programs that destabilize the PC system will help to detect them in time and quickly get rid of them. This kind of 'infection' can come as you like, if the computer, for some reason, is not sufficiently protected. Infection of a computer with malware is a problem that any user connected to the Internet and copying data from external media encounters from time to time. So what is the difference between a computer virus and a computer worm?