Product Owner has a very significant role to play in Scrum as they have the responsibility of outlining the vision of the product concerning its aims and purposes. They also need to be involved in finding the best interests of their customers and stakeholders at the same time. The Product Owner has to ensure that the entire team works towards this effort and delivers higher value to the business and hence they need to be good communicators in the first place and show empathy towards their team members. Also, they are also required to create user stories, prioritize them according to the requirements and put them in the product backlog. Scrum teams need to have one Product Owner, and they can be a member of the development team as well.
The ScrumMaster has to ensure that the impediments are renovated which may be getting in the way of development so that the team can achieve the sprint goal or deliverables. Mostly, a ScrumMaster is not the team leader but acts as a buffer between the development team and the impediments faced in the process. They need to have leadership qualities and ensure that the team members are using Scrum, as intended and are focused on their tasks at hand to attain greater success for the project.
With clearly defined roles, it becomes easy to delegate tasks, and everyone can contribute effectively to the overall objectives of the business and not caught up in unnecessary tasks.
The development team comprises of core people as self-organizing groups capable of analyzing, testing, developing, designing the product which is ready to be shipped. At the end of each sprint, the development team is assigned the task of delivering potentially shippable products in increments.