Answer:
Java applets may be contained in files with the .class extension .
Step-by-step explanation:
Applet seems to be a specific form of software that is integrated into the interactive information creation website. This operates within the application as well as functions on the client-side.
They will use apps operating on various systems, such as Ubuntu, Windows, Mac Os, respectively and it also seems to be the java application that could be inserted in such a page. This operates within a browser as well as functions on the client-side. It inserted in such an HTML file that used the APPLET or OBJECT attribute as well as would be attended on the server.