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Viruses and Worms  • Virus:  A program or   that is loaded onto your computer without your knowledge and runs against your wishes. needed a human action to spread infection.  Can delete important  files, format hard disk, take up system resources that will cause system crash or shutdown.  • Worms:  A program that replicates itself over a computer network and usually performs malicious actions. Replicates itself automatically. – Can infect computers by Spyware, Malware, and Email. What is a virus ?  A virus is a piece of computer code that attaches itself to a program or a file so it can spread from computer to others computer. It infects as it travels. Viruses can damage your software, your hardware, and your files . • Virus (n.)  Code written with the express intention to replicate itself. A virus attaches itself to a host program and then attempts to spread from computer to computer. It might damage hardware, software, or information What is a computer virus?  • Computer viruses are