TortoiseSVN is a Subversion (SVN) client, implemented as a Windows shell extension, making it easy to use with your version control system. There are no command line options that you have to remember and manually enter for each operation, everything is done through graphical user interfaces.
See the state of the files that are in version control through icon overlays. Everything within TortoiseSVN is controlled using context menus within the operating environment of Windows. This makes any Subversion operations very quick and easy.