CVS stands for Concurrent Versions System. It is a free software revision control system. It is open for use to the public that manages changes to documents, programs, and other data stored in computer files. It allows multiple developers to work in partnership. Subversion is a version control system used to maintain the current and proceeding versions of files (like source code, web pages, and documentation).
Subversion is a direct upgrade of CVS and its most compatible successor. It is also an open-source technology and has commonly been used in multiple projects. With CVS, a server stores a current version of a specific project and saves its history. CVS can preserve different branches of a project, and it allows multiple clients to work on and check on the same project simultaneously.
CVS permits various aspects of permutations of the same project. Subversion creates a set of tentative changes and then makes them permanent as true atomic operations. Subversion also permits users to rename, copy, move, and remove files; however, those files will retain their full revision history. Subversion also costs according to the changing size and not the size of the data.