- This article is about the Java format. For another JAR format, see JAR (ARJ Software).
A JAR file is a ZIP file that contains an optional META-INF directory. Within the META-INF directory a manifest file (MANIFEST.MF) has a main section and a list of sections for individual JAR file entries. Jar files are used to store and transfer multiple Java applets and their associated files.
- File extension: .JAR