.tar and .Z extensions on files -- what are they?

[06davis at ac.dal.ca]

sorry folks,

	I don't know if this is the correct newsgroup to ask this question,
but I've been bombing around the FTP sites and have found files with extentions
like .tar and .Z and have wondered if this is a unix-style archive format. If
it is I would be interested in getting the dearchiving program or at least some
idea where I could obtain it.

						Thanks in advance,
						Davis Bennett