- A program designed to be executed from within another application
- A program interacting with the environment that executes it
- A program that cannot be executed directly from the operating system
- Term used to refer to a Java applet
- A program written in the Java programming language that is designed to be placed on a web page
- A Java applet can appear in a frame of the web page, a new application window, Sun's AppletViewer, or a stand-alone tool for testing applets.