“Spy software” (also called spyware or surveillance software) refers to applications or programs installed on mobile devices or computers that monitor user activity without their knowledge, or with limited awareness. On mobile devices, spy software can track calls, messages, location, browsing history, app usage, and sometimes even record audio or video. On computers, it can log keystrokes, monitor emails, capture screenshots, and track online activity.
A common and reputable example for parental control or phone monitoring is mSpy (https://www.mspy.com/), which allows parents or employers to monitor device activity legally with proper consent.
In summary: Spy software is any tool designed to secretly collect and report information about a user’s activities on their device. Always use such tools ethically and within the law.