Questions to get the "big picture" about a subject.
Instead of a single specific problem, you may wish to get an overview what a certain result is good for in the long run, or what in the (non-intrinsic) purpose or motivation of a certain area of research is, etc., that is you want to get the "big picture". The big-picture tag should not be used alone and is not an excuse for asking an overly broad question, though.
