what does `twine upload dist/*` command do?

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I apologize in advance since this seems like a basic question...

I am trying to learn using mujoco(link here), and inside its python binding Makefile it has:

upload:
   rm -rf dist
   python setup.py sdist
   twine upload dist/*

What does twin upload dist/* command do? In addition, this asks me for a username and password like this:

Uploading distributions to https://pypi.python.org/pypi
Enter your username: guest
Enter your password: 
Uploading mujoco-py-0.5.7.tar.gz
HTTPError: 401 Client Error: You must be identified to edit package information for url: https://pypi.python.org/pypi
Makefile:2: recipe for target 'upload' failed

Is this asking for my computer username and password?

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