Roles in agile scrum

(Q). What are the Roles in agile scrum?
The roles in Scrum are quite different from the traditional software methods. Clearly defined roles and expectations help individuals perform their tasks efficiently. In Scrum,there are mainly three roles Product Owner, Development Team, and Scrum Master.

Product Owner: 

• A Product Owner owns the Product backlog and writes user stories and acceptance criteria. 
• A Product Owner is responsible for prioritizing the Product Backlog is prioritized and decides the release date and the content. 
• A Product Owner accepts or rejects product backlog item.
• A Product Owner has the power to cancel the Sprint, if he thinks the Sprint goal is redundant.
• A Product Owner is the one who is responsible for the Return on Investment of the product.

Scrum Master: 

• A Scrum Master is not typically a manager or lead, but he is an influential leader and coach who does not do direct command and control. 
• A Scrum Master is a facilitator and Servant Leader who encourages and demands self-organization from the development team.
• A Scrum Master enables close cooperation across all roles and functions, addresses resource issue and disobedience of scrum practices. 
• A Scrum Master protects the team from external and internal distractions.        

Development Team:

• The Development Team is self-organizing, with a very high degree of autonomy and accountability.
• The Development Team decides how many items to build in a Sprint, and how best to accomplish that goal.
• The Development Team is a cross functional, small and self-organizing team which owns the collective responsibility of developing, testing and releasing the Product increment.
• The Development Team may not appoint any team lead since decisions are taken collectively by the team.