Packages 
Package Description
javax.faces
Top level classes for the JavaServer(tm) Faces API.
javax.faces.application
APIs that are used to link an application's business logic objects to JavaServer Faces, as well as convenient pluggable mechanisms to manage the execution of an application that is based on JavaServer Faces.
javax.faces.bean

These javadoc files constitute the “Faces Managed Bean Annotation Specification for Containers Conforming to Servlet 2.5 and Beyond”

At the time of this writing, a forthcoming JCP effort is being planned to extract the specification for managed beans from JSF and place it into its own specification.
javax.faces.component
Fundamental APIs for user interface components.
javax.faces.component.behavior
APIs for attaching additional behavior to user interface components.
javax.faces.component.html
Specialized user interface component classes for HTML.
javax.faces.component.visit

APIs for traversing a user interface component view.

javax.faces.context
Classes and interfaces defining per-request state information.
javax.faces.convert
Contains classes and interfaces defining converters.
javax.faces.el
DEPRECATED Classes and interfaces for evaluating and processing reference expressions.
javax.faces.event
Interfaces describing events and event listeners, and concrete event implementation classes.
javax.faces.flow

The runtime API for Faces Flows.

javax.faces.flow.builder

Classes for declaring a Faces Flow.

javax.faces.lifecycle
Classes and interfaces defining lifecycle management for the JavaServer Faces implementation.
javax.faces.model
Standard model data beans for JavaServer Faces.
javax.faces.render
Classes and interfaces defining the rendering model.
javax.faces.validator
Interface defining the validator model, and concrete validator implementation classes.
javax.faces.view

Classes for defining a View Declaration Language (VDL) for authoring JavaServer Faces user interfaces.

javax.faces.view.facelets

This package contains public classes for the Java code API of Facelets.

javax.faces.webapp
Classes required for integration of JavaServer Faces into web applications, including a standard servlet, base classes for JSP custom component tags, and concrete tag implementations for core tags.