What is virus in computer? Types of computer viruses?

A computer virus may be a program or a set of program that can cause huge damage to your computer system. computer viruses

Computer viruses are types of malicious software programs that enters the computer system by attacking itself to another program and then spreads itself across the system.

A computer virus has two major characteristics:

  • The ability to replicate itself
  •  The ability to attach itself to another computer file

This code is attached to some part of the normal computer operating system or computer program. Instruction in this code tell the computer to perform some task. This task is often devastating, such as deleting important information of crashing the hard disk. However, there are other viruses that may only slow down your computer or do no serious damage. Some viruses have been known to do nothing more than put a large happy face on your computer screen. Generally, viruses are used to steal personal information or data.

Most Common types of computer viruses

  • Trojans and Trojan horses
  • Botnets
  • Scareware
  • Logical bomb
  • Boot virus
  • Directory virus
  • Resident virus
  • Overwrite viruses
  • Macro virus
  • File infectors
  • Polymorphic virus
  • Direct action viruses
  • Fat virus
  • Worms
  • Space filler virus
  • Sparse infectors
  • Non Resident viruses
  • Stealth viruses
  • Network virus
  • Companion virus
  • Encrypted Viruses
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