does docker imitate the required OS files/libraries for a program?

  docker, linux, linux-kernel, operating-system, windows

does docker imitate the required OS files/libraries for a program?
I simply get confused at this point. If docker isn’t imitating the OS for the required program. Like some sort of java virtual machine or python interpreter, what is it’s significance.
Sorry, I’m a noob and just want to know.

Source: Docker Questions

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