All Ask Computer and Internet Glossary
A virus is an unwelcome, uninvited and uwanted malicious computer program that may do harm to your system. Some viruses can spread from computer to computer. Most viruses will infect computer systems and pass from computer to computer without the knowledge or interaction of the owner of the computer system. There are other viruses that do little, if any, harm to individual systems but may cause damage and/or inconvenience to users online by clogging up the Internet with unnecessary trafic.
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Internet Glossary at AllAsk