computer virus in brief
a portion of a program code that has been designed
to furtively copy itself into other such codes or computer files. It is
usually created by a prankster or vandal to effect a nonutilitarian
result or to destroy data and program code.
A virus
consists of a set of instructions that attaches itself to other
computer programs, usually in the computer's operating system, and
becomes part of them. In most cases, the corrupted programs continue to
perform their intended functions but surreptitiously execute the
virus's instructions as well. A virus is usually designed to execute
when it is loaded into a computer's memory. Upon execution, the virus
instructs its host program to copy the viral code into, or “infect,”
any number of other programs and files stored in the computer. The
infection can then transfer itself to files and code on other computers
through magnetic disks or other memory-storage devices, computer
networks, or online systems. The replicating viruses often multiply
until they destroy data or render other program codes meaningless. A
virus may simply cause a harmless joke or cryptic message to appear on
a computer user's video monitor each time he turns on his computer. A
more damaging virus can wreak havoc on an extremely large computer
system within a matter of minutes or hours, causing it to crash and
thereby destroy valuable data.
computer virus in brief
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