OpenTelemetry is an open-source project that provides a unified standard for service instrumentation and performance measurement. It offers a single application programming interface (API), libraries, integrations, and a software development kit (SDK) for programming languages like Java, Go, and Python. By adopting OpenTelemetry, organizations can streamline their monitoring activities, reduce the need to manually create monitoring solutions, and ensure vendor neutrality. Telemetry data is collected from remote or inaccessible devices and transmitted to a central location for monitoring, analysis, and reporting, providing insights into performance, behavior, and usage patterns of systems and applications. OpenTelemetry enables distributed tracing, metrics collection, context propagation, and plugin ecosystems, making it a valuable tool for observability and performance enhancement. The project is vendor-neutral, community-driven, and standardized, allowing developers to collaborate and promote better coverage, flexibility, and ubiquity as engineers from all over the world contribute to the instrumentation. With OpenTelemetry, teams can optimize their team hours, reduce blind spots or data silos, and monitor emerging technologies easily. By combining with observability backends, OpenTelemetry provides full observability and monitoring in one tool, making it an essential component for modern software development and performance optimization.