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While the term applet is sometimes used to describe small programs included with a computer's operating system, it usually refers to Java applets, or small applications written in the Java programming language. Unlike ordinary applications, Java applets cannot be run directly by the operating system.
Applet as an extension of other software [edit]. In some cases, an applet does not run independently. These applets must run either in a container provided by a host program, through a plugin, or a variety of other applications including mobile devices that support the applet programming model.