Jar, War, Resource Bundle

JAR:
Java Archive, a set of Java classes and their accessories

WAR:
Web Application Archive, is a jar file used to distribute a collection of  JavaSererPage, Javea Servlets, Java classes, XML files, tag libraries, static web pages (HTML and related files) and other resources that together constitute a web application.

EAR: 
Enterprise Archive, a file format used by Java EE for packaging one or more modules into a single archive

Java resource Bundle: A resource bundle is a Java .properties file that contains locale-specific data. It is a way of internationalising a Java application by making the code locale-independent.