What can I do with grouping function of Mindmap

I confirmed how to group one more node for mindmap. And I wonder what else I can do with the function. What I want to know is the purpose of the functionality.
Please let me know how to use the grouping function.

May I know the grouping you referring is the one from right click popup menu of the nodes? If yes then it is simply group the selected elements together and allow user move them like a single selection. Feel free to contact me for any questions and wish you have a good day!