A "snooper program" or "snooper" is basically software for spying on someone on a computer. Sometimes the term spyware also refers to a program for spying on someone, although spyware also describes adware. Snoopers typically record actions and events on a computer and then save this information in a file. For example, common snoopers usually record every keystroke a user types into his or her computer. Some take snapshots of the computer screen at certain intervals and save this for later viewing by the person(s) that installed the snooper. One should assume that if a snooper is installed, virtually everything that happens on your computer is being watched by someone else. Snoopers are usually installed on your computer by an employer, a system administrator, a spouse, a lover, a co-worker, a competitor, etc. Many snoopers are very careful to be invisible to computer users, so most users would have no idea if a snooper was installed.