A Jakarta EE application (formerly also called Java EE or J2EE application) is any deployable unit of Jakarta EE functionality. This can be a single Jakarta EE module or a group of modules packaged into an EAR file along with a Jakarta EE application deployment descriptor. Jakarta EE applications are typically engineered to be distributed across multiple computing tiers. Enterprise applications can consist of combinations of the following: Jakarta Enterprise Beans (EJB) modules (packaged in JAR files); Web modules (packaged in WAR files); connector modules or resource adapters (packaged in RAR files); Session Initiation Protocol (SIP) modules (packaged in SAR files); application client modules; Additional JAR files containing dependent classes or other components required by the application; See also Enterprise software References http://java.sun.com/javaee/reference/glossary/index.jsp Java enterprise platform