Java applets are actually compiled Java class files that are run on a page within a Web browser. Because the Web browser supplies the framework for retrieving and loading an applet and also supplies the main window holding the applet, Java applets are somewhat simpler than a true Java application. A Java application does not require any additional software, such as a Web browser, other than the typical Java runtime files included in the Java Developer's Kit. Java applications are designed to be run in stand-alone mode on a client machine and therefore can be thought of as a known entity. Java applets, meanwhile, can be loaded from anywhere on the Internet, and therefore are subject to severe security restrictions. These security restrictions will be discussed in greater detail later on in this chapter.
Almost every person's first exposure to Java was in the form of a Java applet running within a Web page. Java applets currently are being used for advertising purposes because they provide the capability to include simple animation and sound in a Web advertisement. Many client/server developers currently are looking at the company intranet as an excellent platform on which to finally deliver true cross-platform corporate applications. Because of this, Java applets are certain to quickly progress from "neat" status to true business use status.
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