What Are Computer Viruses?

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Any program that has the ability to reproduce and attach itself to other programs is referred to as a computer virus. Computer viruses can spread to a hard disk or removable disk whenever an infected computer program or system is used and the uninfected disk is accessed. Listing directories, executing programs, printing files, and starting computers are examples of accessing a disk.
In addition to being able to reproduce, viruses may be designed to perform different destructive functions. For example, computer viruses may:
• Display unexplained messages
• Delete specific files
• Erase all of the files that are stored on
a hard disk or a floppy disk
• Make entering from the keyboard
difficult or impossible
• Modify data and document files
• Modify the File Allocation Table
• Modify the Boot Sector
• Add extra files to a disk
• Cause problems printing
• Cause frequent system failures
• Cause problems displaying fonts
After viruses infect files, they may wait for a signal before performing their destructive tasks. There are two types of signals that may invoke viruses to perform destructive tasks; time bombs and logic bombs. Time bombs are signals activated by a specific time of day, date, or hour. Logic bombs are activated when specific functions are performed.

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