What is the Difference between jar, ear and war?

.jar files: These files are with the .jar extension. The .jar files contain the libraries, resources and accessories files like property files.

.war files: These files are with the .war extension. The war file contains the web application that can be deployed on the any servlet/jsp container. The .war file contains jsp, html, java script and other files for necessary for the development of web applications.

.ear files: WAR(Web module) + JAR(can be EJB module or application client module). An EAR(Enterprise archive) is a top-level container which contains modules like: EJB modules, web modules, application client modules etc.