- noun a small application designed to enhance the functionality of a webpage, e.g. adding multimedia effects
- noun a small utility within Microsoft Windows, originally any of the icons in the control panel window, but now any piece of software that is used to configure the computer
- A small application designed to run within another program. Frequently, it is downloaded over a network to be launched on a user's computer. On a Web page, for example, it can provide video and/or audio effects, or perform calculations.
- noun a small application program on the Internet designed to enhance the functionality of a webpage