Subversioning plays a very vital role for Developers. It keeps track of changes to a file over time. It maintains the history of all the changes. This way you do not end up with millions of copies of the project that you cannot make heads or tails out of. With a version control system, every time you commit a set of changes you write a comment describing what you did. Then you can look at the log to see what was changed when and by whom. You can easily look at the differences between versions and easily roll back changes if you need to. You also always have easy remote access to the current version of your project without having to remember which file name you used for it: you simply do an update of your working directory or check out the head version. For more information regarding version control please refer: http://en.wikipedia.org/wiki/Revision_control