Advanced – Non-Functional Testing
Correlation ID – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A unique identifier attached to a request as it flows through distributed systems, enabling end-to-end tracing across services.
In simple words
A shared ID that lets you follow one request across many services.
Exam tip
Correlation IDs are the poor-man’s distributed tracing — essential for microservices debugging.
Related terms
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