Question: what is the difference between agile scrum master and professional scrum master?
Answer: Scrum.org Professional Scrum Master (PSM) vs Scrum Alliance Certified Scrum Master (CSM) ... The Scrum.org PSM certification is different. Attendance at a course is not mandatory. It is much tougher to achieve the PSM certification, so it guarantees a certain level of understanding of Scrum.