COMPUTER VIRUS:
A computer virus is a program or a set of program that disrupts the normal functioning of a computer a computer virus is a kind of the malicious computer program which when executed, replicates it self and inserts its own code .A virus is a program that may disturb the normal working of a computer without the knowledge and permission of the user virus attaches it self to the files in flash drives, hard disks and email attachments a file containing a virus is called infected files.
These computer viruses are present in various types and each of them can infect a device in a different manner .In from the competitive exam point of view. Across the world computer viruses are great issue of concern as they can billions of dollars worth harm to the economy each year.
TYPE OF COMPUTER VIRUS:
BOOT SECTOR VIRUS : It is a type of virus that infects the boot sector of floppy disks or the master boot record of hard disks. The boot sector comprises all the files which are required to start the operating system of the computer .As soon as computer starts it gets infected from the boot sector virus it is usually spread by an infected usb drive cleaning this type of virus is very difficult.
FILE INFECTOR VIRUS :
As the name suggest it first infects a single file and then later spreads itself to other executable files and programs, It is one of the commonly found computer viruses it mainly infect the executable files the files with .com bat or .exe the virus become active when the infected file is executed.
MULTIPARTITE VIRUS :
A virus which can attack both the boot sector and the execrable files of an already infected computer is called a multipartite virus. They infect program files and when the infected file I executed they infect the boot sector.
POLYMORPHIC VIRUS :
These viruses change their code each time an infected file is a executed. That is why are very difficult to detect or remove Example of the polymorphic virus Satan bug,
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