Flask using Nginx?
On a development machine flask can be run without a webserver (nginx, apache etc) or an application container (eg uwsgi, gunicorn etc).
Things are different when you want to handle the load on a production server. For starters python is relatively very slow when it comes to serving static content where as apache / nginx do that very well.
When the application becomes big enough to be broken into multiple separate services or has to be horizontally scaled, the proxy server capabilities of nginx come in very handy.
In the architectures I build, nginx serves as the entry point where ssl is terminates and the rest of the application is behind a VPN and firewall.
Does this help?
I am a .net developer coming over to python.  I have recently started using Flask and have some quick questions about serving files.
I noticed a lot of tutorials focused on nginix and flask.  However, I am able to run flask without nginx.  I'm just curious as to why this is used together (nginx and flask).  Is nginx only for static files?