Spyware is a generic term typically describing software that records, without the knowledge of the computer owner, information about the user, including browser habits or other information, and then transmits that information across the Internet.
Spyware can also interfere with user control of the computer in other ways, such as installing additional software, redirecting Web browser activity, or diverting advertising revenue to a third party. Spyware is often associated with software that displays advertisements or software that tracks personal or sensitive information.