Introduction
Figure 1
A conceptual representation of an ordinary
computer system. The operating system oversees the physical hardware
resources and is responsible for executing individual applications and
allocating those resources to them.
Figure 2
In a virtual machine, physical hardware
resources are divided between the host operating system and any virtual
machines (guest operating systems). The virtual machine manager (VMM)
takes care of managing the virtualized resources. Each virtual machine
only sees the resources allocated to it.
Figure 3
Containers are environments that encapsulate
applications and their dependencies. Applications running inside a
container are functionally isolated from the host. The container manager
runs containers and determines what each container can “see” on the
host. The level of isolation is not as high as VMs (represented by the
dashed lines).
Virtual machines using VirtualBox
Figure 1
You should see a window that resembles this: 
Figure 2
Another way to to turn off the VM is to close the window the VM is
running in. On Windows, click the ‘X’ at the top right corner of the VM
window. You should see a popup that’s similar to this. 
Basics of Containers with Docker
Figure 1
The command line terminal can be opened by
clicking the computer screen icon
Figure 2
The progress display when downloading the
OpenRefine image
Figure 3
A new tab can be opened through the File
menu
Figure 4
Figure 5
Creating Containers with Docker
Figure 1
The nano text editor for your first
Dockerfile