UX - Ability to add expandable/collapsable sections to Boards

This idea is for a new card type called a "Section".  This card type could be added to a board and then other cards added to it.

It would give the functionality of effectively creating sections on a board which could then be expanded or collapsed.

This would allow users to collapse areas of the board which they are not interested in at that time and help to navigate through a large board presenting large amounts of data