The document discusses implementing an event-driven architecture using events instead of synchronous APIs. It explains that events decouple services by allowing them to communicate asynchronously through a centralized event routing system. This loose coupling makes services more independent and resilient, as failures in downstream services do not block upstream ones. It also improves scalability and maintainability by reducing dependencies between services. The document provides examples to illustrate how an event-driven system has less coupling between producers and consumers compared to a synchronous API approach.