The Datadog Service Catalog is a tool that helps organizations centralize knowledge about their services and improve communication between teams. By providing a shared repository of information, such as documentation, deployment history, and code libraries, the Service Catalog bridges the knowledge gap between new engineers and experienced teammates, allowing them to gain an understanding of their services and start contributing right away. The catalog also provides key data that helps teams manage incidents more effectively, deploy code updates with confidence, and provide service observability to the entire organization. This centralized repository of information is automatically populated for APM customers and can be manually registered by non-APM users, making it a valuable tool for simplifying service governance and improving application reliability.