Containers is a virtualization technology, however, they do not virtualize physical servers. Instead, containers is an operating system level virtualization. What it means is that containers share the operating system kernel provided by its host among themselves along with the host. Running multiple containers on a host (physical or virtual) share the host operating system kernel. There is a single operating system kernel provided by the host and used by all containers running on top of it.

Containers are also completely isolated from their host and other containers much like a virtual machine. Containers uses Windows storage filter drivers and sessions isolation for providing isolation of operating system services, such as filesystems, registry, processes, and networks. Each container gets its own copy of operating system resources.

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