An applet is a computer program which is contained within a page on the internet, and whichtransfers itself to your computer and runs automatically while you are looking at that page.
[computing]
applet in British English
(ˈæplɪt)
noun
computing
a computer program that runs within a page on the internet
Word origin
C20: from app(lication program) + -let
In other languages
applet
British English: applet NOUN
An applet is an online computer program that transfers itself to your computer and runs automatically while you are looking at a Web page.
An applet in the user 's computer assimilates all this retrieved information.