sigs.k8s.io/cluster-api-provider-aws@v1.5.5/docs/book/src/topics/failure-domains/index.md (about)

     1  # Failure Domains
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     3  A failure domain in the AWS provider corresponds to an availability zone within an AWS region. 
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     5  In AWS, Availability Zones are distinct locations within an AWS Region that are engineered to be isolated from failures in other Availability Zones. They provide inexpensive, low-latency network connectivity to other Availability Zones in the same AWS Region, to ensure a cluster (or any application) is resilient to failure. 
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     7  If a zone goes down, your cluster will continue to run as the other 2 zones are physically separated and can continue to run.
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     9  More details of availability zones and regions can be found in the [AWS docs](https://aws.amazon.com/about-aws/global-infrastructure/regions_az/).
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    11  The usage of failure domains for control-plane and worker nodes can be found below in detail:
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    13  - [Control Plane](control-planes.md)
    14  - [Worker nodes](worker-nodes.md)