Learn in the textbookComponents of Scrum
DefinitionThe Scrum Master (スクラムマスター) is the role that helps the team and those around it understand and practice Scrum correctly, and is accountable for raising Scrum's effectiveness.
ExplanationThe Scrum Master helps remove problems that block the work (impediments) and encourages the fixed meetings within a Sprint (events) to serve their purpose. The 2020 Scrum Guide describes the role as a leader who serves the team and the organization.
AnalogyIt is like a mountain guide who does not climb to the summit for you, but teaches you to use the gear and points out the dangerous spots so you can make the ascent on your own.