Yup, that's the basic idea. If you ever wished you could use the cp command on an entire os, that's basically what docker lets you do. If that's not a thing tha

Yup, that's the basic idea. If you ever wished you could use the cp command on an entire os, that's basically what docker lets you do. If that's not a thing that's useful to you (for example because you already have a reproducible build, or because you want to be principled about understanding how your system components fit together instead of shrugging and copy-pasting the environment that works but nobody is quite sure how), you probably don't need docker.