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A computer virus is a computer program that can copy itself[1] and infect a computer. The term "virus" is also commonly but erroneously used to refer to other types of malware, including but not limited to adware and spyware programs that do not have the reproductive ability. A true virus can spread from one computer to another (in some form of executable code) when its host is taken to the target computer; for instance because a user sent it over a network or the Internet, or carried it on a removable medium such as a floppy disk, CD, DVD, or USB drive
Computer Virus infect millions of computers all over the world There were over 50,000 computer viruses in 2000 and that number was then and still is growing rapidly. Sophos, in a print ad in June 2005 claims "over 103,000 viruses." And, Symantec, in April 2008 is reported to have claimed the number is over one million. Fortunately, only a small percentage of these are circulating widely.
In 1990, estimates ranged from 200 to 500; then in 1991 estimates ranged from 600
to 1,000 different viruses. In late 1992, estimates were ranging from 1,000 to 2,300
viruses. In mid-
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