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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.
Main article: Java Applet. A Java Applet is a java program that is launched from HTML and run in a web browser. It can provide web applications with interactive features that cannot be provided by HTML.