What is a Virus? A virus is a manmade program, a piece of code that is secretly introduced into a system in order to corrupt it or destroy data. Often viruses are hidden in other programs or documents and when opened, the virus is let loose. Viruses are often disguised games or images with clever marketing titles such as "Me, nude."
What is a Worm? Computer Worms are viruses that reside in the active
memory of a computer and duplicate themselves. They may send copies of
themselves to other computers, such as through email or Internet Relay
Chat (IRC).
What is a Trojan
Horse? A Trojan horse program is
a malicious program that pretends to be a benign application; a Trojan
horse program purposefully does something the user does not expect.
Trojans are not viruses since they do not replicate, but Trojan horse
programs can be just as destructive. Many people use the term to refer
only to non-replicating malicious programs, thus making a distinction
between Trojans and viruses.
What is Spyware? Any software that covertly gathers user information
through the user's Internet connection without his or her knowledge,
usually for advertising purposes. Spyware applications are typically
bundled as a hidden component of freeware or shareware programs that can
be downloaded from the Internet. Once installed, the spyware monitors
user activity on the Internet and transmits that information in the
background to someone else
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