What is Computer Virus –A Brief Description.

A computer virus can be considered as computer program which can harm your computer whenever it is executed. Computer viruses are of different types like

• Worms
• Trojan Horse
• Spy ware
• Root kit
• Ad ware

Etc

A virus is spread from computer to computer by means of e-mails, CDs, pen drives etc. A virus can also be transmitted over network an d can damage all the computers over the network Viruses are sometimes confused with worms and Trojan horses, which are technically different. A worm can exploit security vulnerabilities to spread itself automatically to other computers through networks, while a Trojan horse is a program that appears harmless but hides malicious functions. Worms and Trojan horses, like viruses, may harm a computer system's data or performance. Some viruses and other malware have symptoms noticeable to the computer user, but many are surreptitious or simply do nothing to call attention to them. Some viruses do nothing beyond reproducing themselves.

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Credits- http://en.wikipedia.org