Communicates what is required functionally to meet the needs of the customer. Will form part of the “Definition of Done”.
A burndown chart shows the remaining time (or points) left in a sprint (often along with an ideal trend and required trend to meet goal). These charts are often used during daily scrum meetings to make the team aware of what’s required.
States what is needed to be satisfied in order to mark a user story as “Done”. Will include “Meets acceptance criteria” and often includes non-functional requirements such as performance goals and security requirements.