What is JAR? What Opens a JAR? File Format List from WhatIs.com

File Extension

JAR File Format

Java Archive (a compressed file containing a package of Java application-related files)

JAR file extension

JAR is a file extension for a Java ARchive file that contains Java application- related files.

A JAR file may be compressed using zip compression and contains such things as the class, image, sound files and an optional manifest file.

A JAR file can also be used to deliver an off the shelf open source package run with XML data or, on the web, the file can be downloaded along with the page and then opened as the webpage is received and displayed.

The JAR format is based on the popular zip file format and is somewhat comparable to the Unix tar file.

MIME type: application/java-archive, application/x-java-archive

 

Learn more about JAR files:

 Visit the Java website.

Search for answers to JAR-related questions at IT Knowledge Exchange.

This was last updated in July 2010
Editorial Director Margaret Rouse

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