Virus and its types

Explain the term virus. State the types of viruses?

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A virus is defined as a program which may infect other program by modifying them; the modification involves copy of the virus program that can then go on to infect other program.

Types of virus can be listed as follows:

a) Parasitic virus
b) Memory-resident virus
c) Boot sector virus
d) Stealth virus
e) Polymorphic virus

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