A VOB (versioned object base) is a permanent data repository that stores information that you have placed under Rational® ClearCase® control. A VOB stores the history of all the changes to your files.
A view is a workspace in which you make changes to your files. In Windows Explorer, a view looks like any other directory.
When you work with Rational ClearCase in a snapshot view, you load copies of your source files from a VOB to the view on your computer. Users working in snapshot views can make changes to the same files without interfering with each other.
When you check out a file from a snapshot view, you can modify the copy in your snapshot view. To ensure that you are working with the most current version, update your snapshot view before checking out a file. If you attempt to check out a file that is not the latest version, a warning is displayed.
When you check in a file, the version is updated in the VOB.