Region

Definition:

A region is a set of data centers deployed within a specific geographical location.

Purpose:

Allows you to locate your services and resources closer to your users.

Example:

East US, West Europe, Southeast Asia.

Availability Zone

Definition:

An Availability Zone is a physically separate zone within an Azure region, each with its own power, cooling, and networking.

Purpose:

Ensures high availability and protection against localized failures within a region.

Example:

Within the East US region, there might be multiple Availability Zones labeled as East US 1, East US 2, etc.

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Availability Set (Paired Region)

#Definition:

Availability Sets are used to ensure that VMs are distributed across multiple physical servers within a data center.

Purpose:

Ensures that your application remains available during maintenance events and hardware failures.

Paired Region:

Refers to Azure regions paired together within the same geography for disaster recovery purposes.

#Example: Paired regions include East US - West US, North Europe - West Europe.

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