A computer virus a program which has malicious code. These programs are generally small and are used to perform malicious activities, which include:
1. Downloading other forms of malware onto the user’s computer
2. Accessing a server from the web
3. Creating a backdoor to your computer
4. Stealing confidential information such as bank account and credit card information
Wikipedia provides a extensive article about what and how computer viruses work (click here to view). The best way to protect a computer from computer viruses is to use antivirus and antispyware software.
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