1. File Infectors : This Type of virus infects programs or executable files (with an .exe or .com) extension. When one of these programs is run directly or indirectly, the virus is activated producing damaging effects. Majority of viruses belong to this category,and can be classified depending upon, the actions they carried out.
2. Boot Virus [...]
A “Worm” is a computer program that copies itself. Worms do not infect other programs,but instead they send themselves to other users through e-mail, and Instant Messaging programs.
A “Trojan” is a malicious program that pretends to be a normal program. These programs do something that a user does not expect them to do.
A “Computer Virus” [...]
1945: Rear Admiral Grace Murray Hopper discovers a moth trapped between relays in a Navy computer. She calls it a “bug,” a term used since the late 19th century to refer to problems with electrical devices. Murray Hopper also coined the term “debugging” to describe efforts to fix computer problems.
1949: Hungarian scientist John von Neumann [...]
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