Version control systems is an application files and pictures and other data that are stored in computer file format. Changes are made with regards to numbers that is known as ‘revision number’. For example it a set of information is defined as ‘revision 2’ and when you make changes to next level, it becomes ‘revision 3’ and so on. With the 
help of this revision system, the user can make changes, compare and merge files.
Principles of Operation
To summarize, the file structure is placed in what is called filing. Tools determinants, SVC allows multiple developers to work in parallel on the same file tree by allowing them to publish their changes within the group work in real time. Beyond the collaboration aspect of the SCV can also keep different versions of the same tree (which can be crucial especially when the posting of changes or the unfortunate appearance of regressive bugs). Therefore, the version control systems can be great ways to save for source files. The best known of these applications is undoubtedly CVS (Concurrent Version System) but there are others.
You said Subversion?
Subversion is one of the great family of free software is a version control systems open source. Many SVCs are used to manage source code and often offer tools for software development. Subversion differs from the latter as it allows managing any file system (including of course the source code).
Historical
Karl Fogel and Jim Blandy founded in 1995 the company Cyclic Software to develop and market support for CVS. Having spoken at length about writing a successor to CVS, Jim Blandy proposes a new theoretical model of deposit. Thus, in 2000 Brian Behlendorf (CollabNet society) offers Karl a job as project manager full time to write the future successor of CVS.
Karl’s team developing the project under a free license, it is not long in attracting developers come from everywhere. The main purpose of the project desired by Karl and his team is to provide a functional replacement for CVS. In addition there is no question to supplant but rather to develop software based on the same architecture, but that pushes some known limitations of CVS. Subversion and was thought to be taken over as easily as possible by CVS users.
After 14 months of development, Subversion became independent at the end of August 2001. So that developers continue to use CVS to replace their “baby”. Even if we have to thank for CollabNet funded much development, the Subversion project is still a major open-source project. So CollabNet owns the copyright on the code, but it is licensed under Apache / BSD-style. In short, you can download, modify, and redistribute Subversion as you wish without seeking a specific authorization to CollabNet.
Version control systems provides good and stable solutions and is supported very well. It has been well understood by engineers and has been serving different users for a long time.
