A physically separate data center within a region, with independent power, cooling, and networking. Deploying resources across multiple AZs protects against the failure of a single data center.
The foundation of high availability in AZ-900 and SAA-C03. On AWS, every region has at least 3 AZs. On Azure, Availability Zones. Question: for a 99.99% SLA on Azure VMs, you need at least 2 VMs across 2 different availability zones.
Availability zone (AZ) is a concept that can show up on the exam. Check the full guide to see it in context.