[Rhodes22-list] What's a computer virus???? Answer.
R22RumRunner at aol.com
R22RumRunner at aol.com
Wed Feb 28 17:44:15 EST 2007
A computer virus is a _computer program_
(http://en.wikipedia.org/wiki/Computer_program) that can copy itself and infect a computer without permission or
knowledge of the user. The original may modify the copies or the copies may
modify themselves, as occurs in a _metamorphic virus_
(http://en.wikipedia.org/wiki/Metamorphic_code) . A virus can only spread from one computer to
another when its host is taken to the uninfected computer, for instance by a user
sending it over a network or carrying it on a removable medium. Additionally,
viruses can spread to other computers by infecting files on a _network file
system_ (http://en.wikipedia.org/wiki/File_system#Network_file_systems) or a
file system that is accessed by another computer. Viruses are sometimes
confused with _computer worms_ (http://en.wikipedia.org/wiki/Computer_worm) and
_Trojan horses_ (http://en.wikipedia.org/wiki/Trojan_Horse_(Computing)) . A
worm, however, can spread itself to other computers without needing to be
transferred as part of a host. A Trojan horse is a form of malware that presents
itself as a legitimate program. In contrast to viruses, Trojan horses do not
insert their code into other computer files. Many personal computers are now
connected to the Internet and to local-area networks, facilitating their
spread. Today's viruses may also take advantage of network services such as the
_World Wide Web_ (http://en.wikipedia.org/wiki/World_Wide_Web) , _e-mail_
(http://en.wikipedia.org/wiki/E-mail) , and _file sharing_
(http://en.wikipedia.org/wiki/File_sharing) systems to spread, blurring the line between viruses and
worms. Furthermore, some sources use an alternative terminology in which a
virus is any form of self-replicating malware.
The term comes from the term virus in _biology_
(http://en.wikipedia.org/wiki/Biology) . A computer virus reproduces by making, possibly modified, copies
of itself in the computer's memory, storage, or over a network. This is
similar to the way a biological virus works.
Some viruses are programmed to damage the computer by damaging programs,
deleting files, or reformatting the hard disk. Others are not designed to do any
damage, but simply replicate themselves and perhaps make their presence known
by presenting text, video, or audio, messages. Even these benign viruses can
create problems for the _computer user_
(http://en.wikipedia.org/wiki/User_(computing)) . They typically take up _computer memory_
(http://en.wikipedia.org/wiki/Computer_storage) used by legitimate programs. As a result, they
often cause erratic behavior and can result in system crashes. In addition, many
viruses are bug-ridden, and these bugs may lead to system crashes and _data
loss_ (http://en.wikipedia.org/wiki/Data_loss) .
There are many viruses operating in the general Internet today, and new ones
are discovered every day.
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