ActiveX
ActiveX is Microsoft technology used for developing reusable object oriented software components.
Adware
Adware or advertising-supported software is any software package which automatically plays, displays, or downloads advertising material to a computer after the software is installed on it or while the application is being used.
Aero
Windows Aero is the graphical user interface for Windows Vista, an operating system released by Microsoft in November 2006
Applet
A small Java application that is downloaded by by a Java enabled web browser. Once it has been downloaded, the applet will run on the user's computer. Common applets include drawing programs, calculators and games.
Application
Computer software that performs a task or set of tasks, such as word processing or drawing. Applications are commonly referrer to as programs.