website/content/en/docs/reference/glossary/extensions.md

title	id	date	full_link	short_description	aka	tags
Extensions	Extensions	2019-02-01	/docs/concepts/extend-kubernetes/#extensions	Extensions are software components that extend and deeply integrate with Kubernetes to support new types of hardware.		fundamental extension

Extensions are software components that extend and deeply integrate with Kubernetes to support new types of hardware.

Many cluster administrators use a hosted or distribution instance of Kubernetes. These clusters come with extensions pre-installed. As a result, most Kubernetes users will not need to install extensions and even fewer users will need to author new ones.