applet

Use to refer to an HTML-based program that a browser downloads temporarily to a customer's hard drive. Applet is most often associated with Java.

In general, when referring to a small program, use the name of the program or the most appropriate term, such as item, app, program, add-in, or applet.

Example
A Java applet in an HTML document supports animation, music, and page updates.

See also
add-in, add-on,
app, application,
tool