Spyware is a program placed on a computer or mobile device without the user's knowledge that secretly collects information about the user and then communicates the information it collects to some outside source.

Spyware

Malicious software designed to collect personal or sensitive information from a user's device without their knowledge.

Secretly Collects

Describes the act of gathering information or data without the knowledge or consent of the individuals it pertains to, often raising privacy concerns.

Outside Source

An external reference or origin from which information or material has been brought into a document or project.