A computer virus is a program that attaches itself to, overwrites or otherwise replaces another program in order to reproduce itself without the knowledge of the computer user. Generally, the first thing a virus does is attach itself to other files in such way that the virus code is in effect when the infected files are run. Viruses may be written to multiply, to damage other programs, or to alter certain data.
A computer virus is nothing more than a computer program that is coded to remain hidden in your computer. The virus takes advantage of the operating system to copy itself onto other files or disks. When a new disk is inserted into an infected computer , the virus then copies itself onto other files on that the virus then copies itself onto files that computer hard drive. The cycle continues as long as files are shared between computers.
Booting your computer with an infected floppy disk is one of the most common ways of catching a virus. Downloading a file from the internet or an online service is another common way of catching a computer virus.
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