A geographic area where a cloud provider has one or more data centers. Resources are deployed to specific regions to meet latency, data sovereignty, and availability requirements.
In AZ-900: Azure has 60+ regions. In CLF-C02: AWS has independent Regions. Question: why choose a specific region? Answers: regulatory compliance (GDPR), latency, cost (pricing varies by region).
Region is a concept that can show up on the exam. Check the full guide to see it in context.