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browser hijacker

A specific type of spyware that will allow a hacker or malicious perpetrator to spy on the infected computer's Internet browsing activity. Using a browser hijacker the person responsible for the spyware can deliver pop-up ads, reset the browser homepage, or direct the browser to Web sites the victim would not normally visit.

See The Difference Between Adware & Spyware in the Did You Know?  section of Webopedia.
Also see All About Web Browsers in the Quick Reference section of Webopedia.



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