Yes, S60, the leader in smart phones, is a software platform for mobile phones that uses Symbian OS. It provides a software base for exquisite features in mobile phones eg. large color screens, easy user interface and much more. S60 makes phones look like mini computers!
It also enables mobile services like email, internet surfing, MMS.
It enables many more applications. A host of 3rd party applications are available which can be now plugged with S60.
Have a look at this site supported by Nokia.