The AWS Global Infrastructure consists of Regions, Availability Zones (AZs), Edge Locations.
- An AWS Region is a distinct physical location in a geographic area of the world consisting of two or more AZs.
- At the time of writing, there are more than 20 AWS Regions with more regions planned in the future.
- Data replication can be enabled and controlled across regions.
- The communication between regions depends on the AWS backbone network infrastructure.
- At the time of writing, there are more than 60 Availability Zones.
- An AZ is made up of one or more data centers.
- An AZ is built for fault isolation and therefore designed as an independent failure zone.
- Used for caching.
- There are more Edge locations than Regions.
- The AWS content delivery network (CDN) makes use of Edge Locations.
Source: The AWS Global Infrastructure