Roles

Role name	Description
Product Owner (PO)	Responsible for what the team is building, and why it is building it. The Product Owner, supported by other members of the team, is responsible for keeping the backlog up-to-date and in priority order.
Team lead (Scrum Master)	Ensures that the entire team follows the 'way of working'. Team leads (Scrum Masters) are continually on the lookout for how the team can improve, while also resolving impediments that arise during a sprint.
Developers/Team members	The individuals who actually build the product(s). The team owns the engineering of the product, and the quality that goes with it.