Servlets 

Java programming language classes that dynamically process requests and construct responses, usually for HTML pages 

JavaServer^TM Faces technology

A user-interface component framework for web applications that allows you to include UI components (such as fields and buttons) on a page, convert and validate UI component data, save UI component data to server-side data stores, and maintain component state. 

JavaServer Faces Facelets technology 

Facelets applications are a type of JavaServer Faces applications that use XHTML pages rather than JSP^TM pages.

Expression Language 

A set of standard tags used in JSP and Facelets pages to refer to Java EE components. 

JavaServer Pages (JSP) 

Text-based documents that are compiled into servlets and define how dynamic content can be added to static pages, such as HTML pages. 

JavaServer Pages Standard Tag Library 

A tag library that encapsulates core functionality common to JSP pages 

JavaBeans Components 

Objects that act as temporary data stores for the pages of an application