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

title	id	date	full_link	short_description	aka	tags
Docker	docker	2018-04-12	https://docs.docker.com/engine/	Docker is a software technology providing operating-system-level virtualization also known as containers.		fundamental

Docker (specifically, Docker Engine) is a software technology providing operating-system-level virtualization also known as {{< glossary_tooltip text="containers" term_id="container" >}}.

Docker uses the resource isolation features of the Linux kernel such as cgroups and kernel namespaces, and a union-capable file system such as OverlayFS and others to allow independent containers to run within a single Linux instance, avoiding the overhead of starting and maintaining virtual machines (VMs).