Subversion (SVN) is a version control system initiated in 2000 by Collab Net Inc. It is used to maintain current and historical versions of files such as source code, web pages, and documentation. Its goal is to be a mostly-compatible successor to the widely used Concurrent Versions System (CVS).
For more information, visit Subversion's Wikipedia Page
Build Outputs and User-Oriented Settings should not be put under version control.