A region is a geographic area where the resources used by AS are located.
AZs in the same region can communicate with each other over an intranet, but AZs in different regions cannot.
Cloud data centers are deployed in locations around the world, including North America, Europe, and Asia, and AS applies to different regions. Deploying AS in different regions allows you to tailor policies to better suit your requirements. For example, applications can be designed to meet user requirements in specific regions or comply with local laws or regulations.