Spyware is computer software that is installed surreptitiously on a personal computer to intercept or take
partial control over the user's interaction with the computer, without the user's informed consent.
While the term spyware suggests software that secretly monitors the user's behavior, the functions of
spyware extend well beyond simple monitoring. Spyware programs can collect various types of personal
information, such as Internet surfing habit, sites that have been visited, but can also interfere with user
control of the computer in other ways, such as installing additional software, redirecting Web browser
activity, accessing websites blindly that will cause more harmful viruses, or diverting advertising revenue
to a third party. Spyware can even change computer settings, resulting in slow connection speeds,
different home pages, and loss of Internet or other programs. In an attempt to increase the
understanding of spyware, a more formal classification of its included software types is captured under
the term privacy-invasive software.
In response to the emergence of spyware, a small industry has sprung up dealing in anti-spyware
software. Running anti-spyware software has become a widely recognized element of computer security
best practices for Microsoft Windows desktop computers. A number of jurisdictions have passed
anti-spyware laws, which usually target any software that is surreptitiously installed to control a user's
computer. These days most good antivirus products such as AVG Internet Security have built in
anti-spyware protection.
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