Applet
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An applet is a J2EE compliant software component that runs in the context of web application on a client computer. The applet must run in a container, which is provided by a browser, or through a plug-in, or a variety of other applications including mobile devices that support the applet programming model.
Unlike a program, an applet cannot run independently (has no main entry point), features display and often interaction with the human user, and is usually stateless and has restricted security privileges. An applet characteristically performs a very narrow function that has no independent use. Hence, it is an application -et. Historically, it is possible the introduction of the term in AppleScript in 1993 slightly predated this java usage. A servlet is sometimes informally compared to be "like" a server-side applet, but it is different in its language, functions, and in each of the characteristics described here about applets.
Applets usually have some form of user interface or perform a particular piece of the overall user interface in a web page. This distinguishes them from a program written in a scripting programming language (such as JavaScript) that also runs in the context of a larger, client program, but which would not be considered an applet.
Applets generally have the capability of interacting with and/or influencing their host program, through the restricted security privileges, although they are generally not required to do so.
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