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Is container a VM?

No. Container is the virtualization on the top of OS whereas VM is the virtualization of Compute resources. 

  A VM takes everything that used to sit on the physical server and stores it under the VM; this includes applications, operating systems, the library and data. 

 A VM packs it all in a single image to move around. However, containers use the underlying Docker resources to build the image or add and remove services as you need them.
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