Q. What is Scrum?
The scrum guides :- “a framework within which people can address complex adaptive problems, while productively and creatively delivering products of the highest possible value.”
Scrum is a simple, empirical process framework based upon the principles of transparency, inspection and adaptation.
Scrum operates in short iterations (usually around 2 weeks) - Each increment resulting in a potentially releasable product increment. Working in such short timeboxes allows for rapid feedback and as result you should expect that the end solution will not necessarily be predicable! You should expect for the pivots in direction as the domain area is explored.
Read more @ my blog - The 10 must do's of Scrum