Availability zones (AZs) are isolated locations within data center regions from which public cloud services originate and operate.
Each AZ is isolated, but the AZs in a region are connected through low-latency links.
We design our solutions to span across multiple Availability Zones so if one instance fails, an instance in another Availability Zone can handle requests.
You can also use Elastic IP addresses to mask the failure of an instance in one Availability Zone by rapidly remapping the address to an instance in another Availability Zone.
An Availability Zone is represented by a region code followed by a letter identifier; for example, us-east-1a. To ensure that resources are distributed across the Availability Zones for a region, AWS independently maps Availability Zones to identifiers for each account.
For example, your Availability Zone us-east-1a might not be the same location as us-east-1a for another account.
Amazon Web Services (AWS) is a comprehensive, evolving cloud computing platform provided by Amazon.
A system that can detect that it's not operating property and fix itself without human intervention.
The degree to which a component consistently performs according to its specifications.
The ability of a system or component to be operational and accessible if required (system uptime).