Can you explain how the Circuit Breaker mechanism works and in what scenarios it is used?

The Circuit Breaker pattern prevents repeated calls to a remote service or resource if it is temporarily unavailable or malfunctioning. The goal is to ensure data consistency through a sequence of local transactions, each with a compensating operation to rollback in case of errors.

Thus, Saga breaks a large transaction into a series of steps with the ability to compensate for already completed actions, avoiding locks and increasing system fault tolerance.