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Data Center: Physical place containing servers, storage, networking, power, and cooling. Region: Geographical location containing cloud infrastructure. AD (Availability Domain): Separate infrastructure/data-center location within a region. FD (Fault Domain): Group of hardware within an AD, used to reduce impact of hardware failures. Tenancy: A customer/organization's isolated use of cloud resources. Multi-Tenancy: Multiple customers share cloud infrastructure while their resources/data remain isolated.

Hierarchy: Region → AD → FD → Servers/Resources

Easy way to remember

Region → AD → FD → Compute/VM

Think of it like:

Region = City AD = Separate buildings FD = Separate sections inside a building VM = Your computer/server