What does the -m argument on the winows command line mean? Is there any command line documentation?

Question

Command line

Hello!
I'm learning Python. There, modules are installed via the command line. It's like a black box for me. I just type in a command like this:
python -m pip install pytest
I understand what this line does, but I don't understand what -m means. This is the simplest command, there are some that I just copy and don't understand anything at all. I would like to rummage in the command line. I think you understand me.
Thanks in advance to everyone who helps!

Answer 1

Will help you:
python -?