Availability zones
AWS is built on a global infrastructure, located in more than a dozen regions, including several countries in Europe and Asia, as well as Australia, the United States, Canada, and Brazil.
Each region is divided up into separate physical areas, in what AWS calls availability zones, or just AZs. The data centers are built in small, fault isolated clusters, in these availability zones, which are typically tens of miles apart. This makes a regionwide outage less likely, in the case of a natural disaster. Availability zones within a region, are connected with low-latency private connections. Each region has a minimum of two AZs, but the largest currently has five. Although VPCs must be contained in a single region, they can ...
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