What is JavaServer Faces (JSF) in Java programming language ?

• JSF is a component-based MVC(Model View Controller) framework which enables you to completely separate Java code from HTML pages. 
• It is a new technology for developing server-side Web applications using Java.

• For example: to display a table with rows and columns you can add a table component to a page, there is no need to write html table , tr ,td tags with loop structure to show table data in JSF.

• JSF has the following parts:

• A set of user interface components(HTML tags, form, table, JSF component)
• An event-driven programming model
• A component model that enables third-party developers to supply additional components

• The application developed using JSF is easy to debug and maintain.

Core JavaServer Faces (3rd Edition)
Mastering JavaServer Faces (Java)