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Computer virus and types of computer virus-computer world

 Computer virus

 A computer virus is a small program that can copy itself and infect the system without the permission of other user. How we recognize viruses virus if It meet to criteria

 It must execute itself

 It must application itself, it may replace other executable file with a copy of the virus infected file.

 viruses can increase their chance of spreading two other computers by affecting files on a network file system or a file system that is accessed by another computer, it can carried it on a removable medium such as a floppy disk, CD, DVD or USB drives. The term "computer virus" means is sometime used as a catch all phrase to include all type of Malware. File infected virus boot sector viruses,  Master boot record viruses, multi. participate. viruses and macro viruses. This classification depend upon their target area a mode of operation. 

virus can be divided into two types based on their behavior when They are executed. 

  1. Non resident viruses : Non resident viruses immediately search for other host that can be infected, infect those targets, and transfer control to the application program they infected.
  2. Resident viruses : Resident viruses to note search for host when they are started. Instead resident virus load itself into memory on execution and transfer control to the host program. The virus stay active in the background and infects new post when those files are accessed by other programs for the operating system itself.

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