What is python-minimal?

I had a problem that gave me an error message in the terminal whenever I tried executing a command. I checked a forum, and the most helpful solution instructed me to run this command:

sudo apt-get --reinstall install python3-minimal

So did I reinstall a file named 'Python3-minimal', or did I reinstall a 'minimal' version of python3? I am new to all this, so please forgive me for such a dumb question.

Package description:

Minimal subset of the Python language (version 3.5) This package contains the interpreter and some essential modules. It can be used in the boot process for some basic tasks. See /usr/share/doc/python3.5-minimal/README.Debian for a list of the modules contained in this package.

You basically re-installed the packages that make the core of python v3. The README.debian does not tell what the essential modules are though ;).