A jar file is the same as a zip file, except that the jar file contains a META-INF directory to store metadata or attributes (may be in a MANIFEST.MF file)
A jar file usually has file name extension .jar
It contains mainly java class files but any types of files can be included, e.g., XML files, HTML files, properties files, gif/jpg image files, text files, PDF files, and binary files etc.
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