VIRUS stands
for -Vital Information Resources under Siege.
As defined A computer virus is a
self-replicating program containing code that explicitly copies itself and that
can ’infect‘ other programs by modifying them or their environment such that a
call to an infected program implies a call to a possibly evolved copy of the virus.

It is a set of instructions that manipulate the functions of your computer’s operating
system. ‘Virus’ is actually a generic term for software that is harmful to your
system. They spread via disks, or via a network, or via services such as email.
Irrespective of how the virus travels, its purpose is to use or damage the
resources of your computer.

The first viruses were spread as part of computer
programs, or by hiding in floppy disks. Most modern viruses are spread by
Internet services, in particular email. Malicious software or malware for
short, are ―programs intentionally designed to perform some unauthorized -often
harmful or undesirable act.” Malware is a generic term and is used to describe
many types of malicious software, such as viruses and worms.
Some viruses display symptoms, and
some viruses’ damage files and computer systems, but neither symptoms nor
damage is essential in the definition of a virus; a non-damaging virus is still
a virus. There are computer viruses written for several operating systems
including DOS, Windows, Macintosh, UNIX, and others. A typical structure of a
computer virus contains three subroutines. The first subroutine, infect – executable, is responsible
for finding available executable files and infecting them by copying its code
into them. The subroutine do-damage, also known as the payload
of the virus, is the code responsible for delivering the malicious part of the virus.
The last subroutine, trigger-pulled checks if the desired conditions are met in
order to deliver its payload.

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