[Wikipedia] JAR (file format)
A JAR (Java ARchive) is a package file format typically used to aggregate many Java class files and associated metadata and resources (text, images, etc.) into one file for distribution.
JAR files are archive files that include a Java-specific manifest file. They are built on the ZIP format and typically have a .jar file extension.
https://en.wikipedia.org/wiki/JAR_(fi...)
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