If a program wants you to install Java just go ahead and do it....it has to do with
visuals on a webpage most often..
Java allows you to play online games, chat with people around the world, calculate your mortgage interest, and view images in 3D, just to name a few.
It can also be used to build a small application module or applet for use as part of a Web page. Applets make it possible for a Web page user to interact with the page.