What is Viruses?

What is Viruses? 

A computer virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes.
 Viruses can also replicate themselves. All computer viruses are man-made.
 A simple virus that can make a copy of itself over and over again is relatively easy to produce.
 Even such a simple virus is dangerous because it will quickly use all available memory and bring the system to a halt.
 An even more dangerous type of virus is one capable of transmitting itself across networks and bypassing security systems.
 Since 1987, when a virus infected ARPANET, a large network used by the Defense Department and many universities, many antivirus programs have become available.
 These programs periodically check your computer system for the best-known types of viruses.
 Some people distinguish between general viruses and worms.
 A worm is a special type of virus that can replicate itself and use memory, but cannot attach itself to other programs.

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