what is a computer virus?

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What is a Computer Virus?
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CLASSIC VIRUS Classic virus is a term that was
coined in 1983. These viruses are malicious
programs that rewrite existing computer code on
your computer. Classic viruses are not so much
unwanted additions to your system as they are
mutations of existing code .
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TROJANS Trojans, or Trojan Horses, are additions
to your system. These malicious programs
masquerade as legitimate files in your email,
deceiving you into willfully adding them to your
hard drive. Trojans rely on you to intentionally
open your computer to them. Once on your machine,
Trojans then function as independent programs
that operate secretly. Trojans commonly steal
passwords or perform denial of service (overload
your system) attacks. Examples of Trojans include
Backdoor and Nuker.
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WORMS Worms, or Internet Worms, are also
unwanted additions to your system. Worms are
different from Trojans, though, because they copy
themselves without your direct assistance... they
robotically worm their way into your email, and
begin broadcasting copies of themselves without
permission. Because they do not require user
intervention to reproduce, worms reproduce at an
alarming rate. Examples of worms include Scalper,
SoBig, and Swen.
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ADWARE AND SPYWARE Adware and Spyware are
cousins to trojans, worms, and viruses. These
programs lurk on your machine. Adware and spyware
are designed to observe your Internet habits and
then pummel you with advertising, or to report
back to their owners via secret messages.
Sometimes, these products will even use your hard
drive to store and broadcast pornography and
advertising back to the Internet.
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These semantics and definitions of
viruses/malware can be very obscure to the
non-technical user. However, it isn't crucial to
distinguish between these products technically.
What is important is how you consciously defend
against these malware infections.
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