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Update content/en/docs/concepts/extend-kubernetes/api-extension/_index.md 

Co-authored-by: Tim Bannister <tim@scalefactory.com>
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John Huang 2023-09-22 08:27:29 +08:00 committed by GitHub
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Custom resources are extensions of the Kubernetes API. Kubernetes provides two ways to add custom resources to your cluster:
- The [CustomResourceDefinition](/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/)
API resource allows you to define a CRD object creates a new custom resource with a name and schema that you specify.
The Kubernetes API serves and handles the storage of your custom resource. CRDs allow users to create new types of resources without adding another API server.
- The [CustomResourceDefinition](/docs/concepts/extend-kubernetes/api-extension/custom-resources/)
(CRD) mechanism allows you to declaratively define a new custom API with an API group, kind, and
schema that you specify.
The Kubernetes control plane serves and handles the storage of your custom resource. CRDs allow you to
create new types of resources for your cluster without writing and running a custom API server.
- The [aggregation layer](/docs/concepts/extend-kubernetes/api-extension/apiserver-aggregation/) sits behind the primary API server, which acts as a proxy. This arrangement is called API Aggregation(AA). To users, the Kubernetes API appears extended.