I'm new to programming, I don't know where consider as "document root of web server"

Hello everyone, I am new to Django and quite new to Python as well.

I came across this advice while I'm going through the Django tutorial here

https://docs.djangoproject.com/en/1.9/intro/tutorial01/

It mentioned "It's not a good idea to put any of this Python code within your Web server's document root..."

My very newbie question is:  what's document root of web server?

I have no knowledge in building a web site so please forgive my very shallow question.

Cheers

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