Yes, Designers can use git too!
Version control is a system which records and stores every change made to a set of files, so that you can go back to a previous state at any time. Developers have been using this method for a long time (the first kind of version control system was developed in the 70s) and it is now unthinkable to seriously write software without one.
In contrast, version control is something that most designers neglect, or don’t even think about. And as a result, these designers (and their teams) would often face the classical problems of the pre-version-control era, such as…