The vocabulary the exams and the daily work both assume you already have. Every entry gives the definition, the source it is drawn from, and the misreadings that follow from getting it wrong.
22 concepts in Scrum, page 2 of 2
The single objective for one Sprint, the Sprint Backlog's commitment, and the only thing in a Sprint the Developers actually promise.
Scrum
Value is a guess until a Sprint tests it. The Increment is the evidence, and a forecast is not a commitment.
Scrum