What do you understand by Java Server Faces (JSF)?

It is a component-based user interface framework which works on the server side and is used for the development of web applications. In this, a well-defined programming model is provided and it also consists of rich APIs and various tag libraries. The new feature called Facelets in JSF 2 is used as its default templating system. It helps in providing components and also manages its states. Server-side validation, data conversion, internationalization support, accessibility, page navigation, extensibility are some features provided by Java Server Faces.