Definition of spyware
: software that is installed in a computer or mobile device without the user's knowledge and that transmits information about the user's activities Jan should scan her computer for viruses, worms, and spyware …— Kenneth Baldauf and Ralph Stair Smartphones belonging to more than three dozen journalists, human rights activists, and business executives have been infected with powerful spyware that an Israeli firm sells, purportedly to catch terrorists and criminals, The Washington Post and other publications reported.— Dan Goodin
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