Stalkerware is a type of malicious software secretly installed on a person’s device - such as a smartphone or computer - without their consent. Its primary purpose is to monitor, track, and collect personal information about the user, including location data, messages, call logs, photos, and browsing activity. Stalkerware is often used by individuals seeking to surveil partners, employees, or others, raising serious privacy and security concerns. Unlike legitimate parental control or security apps, stalkerware operates covertly, making it difficult for victims to detect its presence. Its use is considered unethical, and in many jurisdictions, it is illegal due to its invasive nature.