Commercial spyware was once used mostly by parents to monitor what their children were doing on the Internet, and by employers, supposedly to determine which employees were goofing off by surfing the Internet. A more serious use was to detect potential theft of information assets or industrial espionage. Developers market their spyware by offering it as a tool to protect the children, when in fact their true market is people who want to spy on someone. Nowadays, the sale of spyware is driven to a great extent by people's desire to know if their spouse or significant other is cheating on them.