Scrum is an agile project methodology that helps you deliver a software project in a more efficient way. Sometimes the methodology is pretty much overvalued. Basically the classical truth are not changed: either you know what you should deliver, or you do not have a clue
1. If you know what you should delivery, you can deliver with SCRUM in a fast and more efficient way.
2. If you do not know what you should delivery, you are going with SCRUM to the wall in a fast and more efficient way.