The Scrum Team must choose at least one high priority process improvement item, identified during the Sprint Retrospective, and place it in the Sprint Backlog.
What is a Scrum Master?
A scrum master is the scrum team member tasked with fostering an effective and productive working environment and guiding others to understand scrum values, principles and practices. Scrum masters tend to be people-oriented, have a high level of emotional intelligence, and find joy in helping team members to grow.