Cloud-computing services are operated from giant datacenters around the world. AWS divides this up by 'regions' and 'availability zones'. Each AWS region is a separate geographic area, like EU (London) or US West (Oregon), which AWS then further subdivides into what it calls availability zones (AZs). An AZ is composed of one or more datacenters that are far enough apart that in theory a single disaster won't take both offline, but close enough together for business continuity applications that require rapid failover. Each AZ has multiple internet connections and power connections to multiple grids: AWS has over 80 AZs.Google uses a similar model, dividing its cloud-computing resources into regions that are then subdivided into zones, which include one or more datacenters from which customers can run their services. It currently over eight zones: Google recommends customers deploy applications across multiple zones and regions to help protect against unexpected failures.Microsoft Azure divides its resources slightly differently. It offers regions that it describes as is a "set of datacentres deployed within a latency-defined perimeter and connected through a dedicated regional low-latency network". It also offers 'geographies' typically containing two or more regions, that can be used by customers with specific data-residency and compliance needs "to keep their data and apps close". It also offers availability zones made up of one or more data centres equipped with independent power, cooling and networking.