The "Save section" feature allows you to save any section, and you can add that section in the next time you use it. But you only can use this feature with Basic, Pro and Premium plans.
For example, on the "About us" page has the "Video Banner" section and you want to save that section to use for other pages.
In the future if you want to add the "Video Banner" section to any page, you can find it on MY SECTION tab.