1. This tool gives you power to work collaboratively. And this collaboration will happen with out impacting anyone's work.
2. It points out changes between existing code and uploaded code then and there.
3. Shows difference while merging code in trunk.
4. Find out old code by just providing the version number
Subversion is a free/open source version control system (VCS). That is, Subversion manages files and directories, and the changes made to them, over time. This allows you to recover older versions of your data or examine the history of how your data changed. Review collected by and hosted on G2.com.