S60 on Symbian is the technical name for the software platform used by N-Gage compatible smartphones.
All Next Gen N-Gage compatible phones run on a version of this platform called S60 3rd Edition which itself runs on the Symbian OS.
This means that as well as N-Gage games these phones can also run S60 3rd Edition games and applications.
S60 applications can access the full power of your S60-compatible phone, they can do more and run a lot faster than Java.
If you want to use your N-Gage compatible phone for more than just games, if you want to turn it into a pocket-sized PC,
dive into the world of Symbian S60 3rd Edition over on our sister site All About Symbian.