Spyware

A somewhat vague term generally referring to software that is secretly installed on a users computer and that monitors use of the computer in some way without the users’ knowledge or consent. 

Most spyware tries to get the user to view advertising and/or particular web pages. Some spyware also sends information about the user to another machine over the Internet

Spyware is usually installed without a users’ knowledge as part of the installation of other software, especially software such as music sharing software obtained via download.

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