https://www.docker.com/whatisdocker/
How is this different from Virtual Machines?
Virtual Machines
Each virtualized application includes not only the application - which
may be only 10s of MB - and the necessary binaries and libraries, but
also an entire guest operating system - which may weigh 10s of GB.
Docker
The Docker Engine container comprises just the application and its
dependencies. It runs as an isolated process in userspace on the host
operating system, sharing the kernel with other containers. Thus, it
enjoys the resource isolation and allocation benefits of VMs but is much
more portable and efficient.
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