Visualforce

At the front of any great business application is a great user interface that's easy to use, powerful, and suited exactly for the tasks, users, and devices the application serves. Visualforce is a complete framework for creating such user interfaces, enabling any kind of interface design and interaction to be built and delivered entirely in the cloud. The user interfaces you build with Visualforce can extend the standard Force.com platform look and feel, or replace it with a completely unique style and set of sophisticated interactions. Because Visualforce markup is ultimately rendered into HTML, designers can use Visualforce tags alongside standard HTML, JavaScript, Flash, or any other code that can execute within an HTML page on the platform. And that's only the beginning: you can also use Visualforce pages to combine data from multiple Force.com platform objects, or blend data from Web services into your applications, as we discuss in Moving Beyond Point-and-Click App Development.