It can be the case also with your Git (the VCS, not GitHub, GitLab, etc. - it's not the same) on local machine. In situations when you would like to save your progress on current branch and move to another it can be helpful in order not to lose your uncommited changes. In such a way you'd like to use use git stash. Then you will see the WIP... as one of the branches in Git Bash/GUI.