Enterprise applications (or J2EE applications) are applications that conform to the Java 2 Platform, Enterprise Edition, specification.
Enterprise applications can consist of the following:
A J2EE application is represented by, and packaged in, an enterprise archive (EAR) file.
Related concepts
Related tasks
Deploying and administering applications
Related information
http://java.sun.com/blueprints/guidelines/designing_enterprise_applications_2e/