<pedantic>Well it is actually from UNIX: its a shorthand extension denoting a tape archive</pedantic>. It's not specifically for any OS - you'll find utilities to decompress tar files for most OS's. Both tars and jars are simmilar in that they are compressed files. Also jar files don't have to contain Java classes - though its unusual for them not to.
Round these parts, posting the same question in multiple forums is bad practice. It can make it rather difficult to follow a conversation, plus folks spend time saying things that were just said.
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