What's the use of data-dir?

[Vrihub]

What's the use of data-dir in poetry? I can't find any explanation in the documentation or in the source code. The currently configured data-dir in my poetry instance doesn't even exist, yet poetry seems to work just fine. Hints?

[Secrus]

It is used for example as a default install dir of poetry-managed Python interpreters

[Vrihub]

Thanks, so it's meant to host data used by poetry itself, not data related to the projects that poetry helps to manage (these would go into each project's venv(s)), right?

Now, you mentioned, "poetry-managed Python interpreters", but I can't find examples about that in the docs. On the contrary, the "Basic usage" page states:

Poetry will not automatically install a python interpreter for you. If you want to run Python files in your package like a script or application, you must bring your own python interpreter to run them.

Can you clarify?