Distributed tracing tools help teams improve performance monitoring and troubleshooting by tracking a single request as it moves across multiple services, databases, and APIs in a distributed system. This end-to-end visibility allows engineers to identify where delays, errors, or failures occur, making it easier to detect performance bottlenecks and understand system dependencies. In my opinion, the most important capability is trace visualization, because it provides a clear, step-by-step view of request flow across services, helping teams quickly pinpoint issues and understand system behavior. While root cause analysis is also highly valuable for automatically identifying problems, visualization offers the most immediate clarity, enabling faster and more effective troubleshooting in complex environments.