Hi.
It is one of a class of program that tracks revisions in files.
Debian provides:
Quote:
Description: Concurrent Versions System
CVS is a version control system, which allows you to keep old versions
of files (usually source code), keep a log of who, when, and why
changes occurred, etc., like RCS or SCCS. Unlike the simpler systems,
CVS does not just operate on one file at a time or one directory at
a time, but operates on hierarchical collections of directories
consisting of version controlled files.
-- excerpt from apt-cache show cvs
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For a comparison of such programs, see
Comparison of revision control software - Wikipedia, the free encyclopedia which will also provide links to specific articles or web pages.
Google and Wikipedia are your friends ... cheers, drl