(4-19-04) - What is spyware and why should Internet users be concerned? "Adware is advertising-supported software that displays pop-up advertisements whenever the program is running. Often the software is available online for free, and the advertisements create revenue for the company. Although it's seemingly harmless (aside from the intrusiveness and annoyance of pop-up ads), adware can install components onto your computer that track personal information (including your age, sex, location, buying preferences, or surfing habits) for marketing purposes. . ."