What is a Burndown Chart ?
It's a visual representation of remaining amount of work for any specific sprint/release at scrum team level.
Purpose - Track the remaining amount of work
Referred - At least once every day
Owned By - The scrum Team
Represents - Real time total amount of work pending for the sprint of any team
Different Types of Burndown Chart
Release Burndown Chart
Epic / Feature Burndown Chart
Sprint Burndown Chart