Observability is key to understanding the inner workings of a Kubernetes application, and a service mesh is a powerful tool for enhancing observability within a Kubernetes app. It provides a comprehensive view of app behavior, performance, and health by delivering deep visibility into the communication and interactions between microservices. Service meshes facilitate effective monitoring, troubleshooting, and optimization through features like distributed tracing, metrics collection, and logging capabilities. Operators gain valuable insights into latency, error rates, request flows, and resource utilization, and this allows them to identify bottlenecks, detect anomalies, and make data-driven decisions to improve their Kubernetes application's overall performance and reliability.