What is Sprint?
A sprint (or iteration) is a short, fixed-length timebox — commonly two weeks — in which the team plans, builds, and delivers a usable increment of the product. The length never stretches to fit the work; the work is sized to fit the timebox.
That fixed rhythm is the engine of empiricism: every sprint ends with something real to inspect, feedback to absorb, and a fresh chance to adapt the plan. On the exam, protecting the timebox and the sprint goal is almost always the right instinct.