What’s the difference between Docker and classic Virtualization techniques?

Hi,

 The VM or virtual machine emulates a physical computing environment,  CPU, memory, hard disk, network,....  are managed by a virtualization layer which translates these requests to the underlying physical hardware.

Docker was using LXC or Linux Containers. that runs in the same operating system as its host. This allows it to share a lot of the host operating system resources. 

i would say, Docker is a lightweight virtualisation technique.