A Certified Scrum Master (CSM) is a professional who has been certified by the Scrum Alliance, a non-profit organization that promotes the Scrum framework for Agile software development. The CSM certification is earned by individuals who have completed a two-day training course and passed an exam, and demonstrates a level of understanding and commitment to the Scrum framework. A CSM is responsible for facilitating the Scrum process within a development team and ensuring that the team follows the Scrum principles and practices.

SCRUM is an Agile Development method, which concentrates particularly on how to manage tasks within a team-based development environment. You can find an article about all agile principles in the related links.

James Schiel has written:

'Enterprise-scale agile software development' -- subject(s): Agile software development, EXtreme programming, Scrum (Computer software development)

'The ScrumMaster Study Guide' -- subject(s): Agile software development, Scrum (Computer software development)

A scrum master helps to facilitate scrum to the larger team by ensuring the scrum framework is followed. He/she is committed to the scrum values and practices, but should also remain flexible and open to opportunities for the team to improve their workflow. If you want to know more about this, you may check at tryScrum and I hope you will get more useful information.

Scrum is an iterative method of product development and project management.

Scrum methodology is highly useful in projects which involve uncertainty. Its approach to planning and managing projects is by bringing decision-making authority to the level of operation properties and certainties

useful link: http://www.scrum-master.info