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Service mesh software manages communication between microservices in distributed applications, providing traffic management, security, and observability without requiring changes to application code. A service mesh deploys a sidecar proxy alongside each service instance, handling all network communication transparently. Traffic management features include load balancing, circuit breaking, retries, timeouts, and canary deployments. Security capabilities provide mutual TLS encryption between services, fine-grained access policies, and certificate management. Observability features collect distributed traces, metrics, and logs across service-to-service calls for debugging and performance monitoring. Service meshes become valuable as microservice architectures grow beyond 10–20 services, where manual management of inter-service communication becomes unsustainable.