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~~To put it in simpler terms, I'd say that containers virtualise only the operating system rather than the whole underlying machine.~~
I guess not then.
It virtualises only parts of operating system (namely processes and network namespaces with ability to passthru devices and mount points). It is still using host kernel, for example.
I wouldn't say that namespaces are virtualization either. Container don't virtualize anything, namespaces are all inherited from the root namespaces and therefore completely visible from the host (with the right privileges). It's just a completely different technology.
The word you’re all looking for is sandboxing. That’s what containers are - sandboxes. And while they a different approach to VMs they do rely on some similar principals.