What is a virus? What does it do?
Computer virus in not like flu-virus that will leave you in cough and cold, but instead leaves your computer in such situations, may be worst if not treated on time. Ever wondered, why your engineer formatted your computer? What did he tell you? Your computer was infected by virus or similar stuff...!
What are the types of infection?
Viruses - A virus is a small piece of code that piggybacks on real programs. For example, a virus power attach itself to a program such as a computer program program. Each time the computer program program runs, the virus runs, too, and it has the chance to reproduce by attaching to different programs or create severe damage.
E-mail viruses - An e-mail virus moves about in e-mail messages, and commonly replicates itself by mechanically mailing itself to dozens of people which are in the victim's e-mail address book.
Worms - A worm is a small piece of code that uses computer networks and safety holes to replicate itself. A copy of the worm scans the network for another machine that has a specific safety hole. It copies itself to the new machine mistreatment the safety hole, and then starts replicating from there, as well.
Trojan horses - A Trojan horse is just a computer program. The program claims to do one thing (it may claim to be a game) but instead makes damage once you run it (it may erase your hard disk). Trojan horses have no way to replicate automatically.
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