What is JEE (Java Enterprise Edition) ?

JEE

• JEE Stands for Java Enterprise Edition.
• JEE is an environment for developing and deploying enterprise applications.
• JEE specification is defined by Oracle Inc.
• The JEE platform is one of the best platform for the development and deployment of enterprise applications.
• The JEE platform is consists of a set of services, application programming interfaces (APIs), and protocols, which provides the functionality necessary for developing multi-tiered, web-based applications.

You can download the JEE SDK and development tools from http://java.oracle.com/

A JEE module is a software unit that consists of one or more JEE components of the same container type along with one deployment descriptor of that type.

JEE components are written in the Java programming language and are compiled in the same way as any program in the language.
 
The difference between JEE components and "standard" Java classes is that JEE components are assembled into a JEE application, verified to be well formed and in compliance with the JEE specification, and deployed to production, where they are run and managed by the JEE server or container.