What is the difference between Jar and Ear and War files?

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JAR files (Java ARchive) allows aggregating many files into one, it is usually used to hold Java classes in a library. i.e. Math.jar

WAR files (Web Application aRchive) stores XML, java classes, and JavaServer pages for Web Application purposes.

EAR files (Enterprise ARchive) combines JAR and WAR files to make a combined archive for Enterprise Applications.
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