Why is dotenv needed?

Question

Python

Good afternoon, I decided to understand the topic of storing settings, the choice fell on storage in the .env file. I found such a dotenv library, read the description of the github of this library and looked at examples there, and I didn’t understand at all what it was for, if you can simply call it:

import os

os.getenv('Name', 'Not found name')

Perhaps I misunderstood something and someone can briefly explain how to use it correctly or for what?