Azure Regions
A region is a geographical area on the planet that contains one or more datacenters that are nearby and networked together with a low-latency network.
Some features are only available in certain regions.
Some other services are not bound to a specific region because they are worldwide; examples are Azure Active Directory, Azure DNS, and Azure Traffic Manager.
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Azure Availability Zones
Availability zones are physically separate datacenters within an [[azure-region]].
Azure infrastructure
There is a **physical structure**, in which every datacenter is located in an [[azure-availability-zones]], each Availability zone is located within an [[azure-region]], and Regions are coupled in [[azure-region-pairs]].
Azure Cosmos DB
You can configure your databases to be globally distributed and available in any of the [[azure-region]]. To lower the latency, place the data close to where your users are.
Azure Region Pairs
It may happen that an event is so big that it impacts a whole [[azure-region]]. In that case, [[azure-availability-zones]] are not enough to prevent data loss and application downtime. Therefore, we need to pair regions so that one acts as a fallback for the other.