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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.
An applet is a little application. Prior to the World Wide Web, the built-in writing and drawing programs that came with Windows were sometimes called applets.. On the Web, using Java, the object-oriented programming language, an applet is a small program that can be sent along with a Web page to a user.