Adware is any software application in which advertising banners are displayed while the program is running. The authors of these applications include additional code that delivers the ads, which can be viewed through pop-up windows or through a bar that appears on a computer screen. The justification for adware is that it helps recover programming development cost and helps to hold down the cost for the user. Adware has been criticized for occasionally including code that tracks a user's personal information and passes it on to third parties, without the user's authorization or knowledge.
Small program that runs automatically every time you start your Internet browser. BHOs are installed on your system by another software program. They are typically installed by toolbar accessories and can track your internet usage and collect other information that is used.