The Primary Team roles in scrum are named as

• Product Owner

• Scrum Master

• Development Team

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Scrum Master, Product Owner, and Team are considered as people who are committed to the project while customers and executive management are considered as involved but not committed to the project.

Scrum Teams are self-organizing and cross-functional. Self-organizing teams choose how best to accomplish their work, rather than being directed by others outside the team.   
Cross-functional teams have all competencies needed to accomplish the work without depending on others not part of the team. The team model in Scrum is designed to optimize flexibility, creativity, and productivity. Scrum Teams deliver products iteratively and incrementally, maximizing opportunities for feedback. Incremental deliveries of “Done” product ensure a potentially useful version of working product is always available. All the roles are based on the concept of “Servant Leadership”. 

The Scrum Master 

The Scrum Master is responsible for ensuring Scrum is understood and enacted. Scrum Masters do this by ensuring that the Scrum Team adheres to Scrum theory, practices, and rules.

The Product Owner 

The Product Owner is responsible for maximizing the value of the product and the work of the Development Team. How this is done may vary widely across organizations, Scrum Teams, and individuals.  The Product Owner is the sole person responsible for managing the Product Backlog. 

The Development Team 

The Development Team consists of professionals who do the work of delivering a potentially releasable Increment of “Done” product at the end of each Sprint. Only members of the Development Team create the Increment.