define scrum master
A scrum master is the facilitator for an agile development team. Scrum is a methodology that allows a team to self-organize and make changes quickly, in accordance with agile principles. The scrum master manages the process for how information is exchanged. Although the scrum analogy was first applied to manufacturing in a paper by Hirotaka Takeuchi and Ikujiro Nonaka, the approach is often used in agile software development and other types of project management.