Virus 03
Virus 03 : (ICT) A computer virus is a piece of program code that, like a biological virus, makes copies of itself by attaching itself to another program. The virus can waste the host's resources, and sometimes destroy or change files. While viruses are usually malicious - destroying data or crashing network services - many do nothing or are just annoying (for example, displaying a message to the user). Many viruses are made to wait a long time before doing anything, usually destroying data on a certain day, like a holiday. Viruses are usually spread by a computer network, by e-mail, or by removable media, like a floppy disk or memory stick
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