Gunicorn
In plain terms
A Python WSGI server for running web applications in production.
Going deeper
Gunicorn runs Python web apps by managing multiple worker processes to handle requests efficiently. It's a common production server for Flask/Django.
Under the hood
Pre-fork worker model handles concurrency; typically sits behind Nginx as a reverse proxy.
Examples
Deploying Flask/Django, production Python apps, behind Nginx.
Think of it like...
Like a team of workers behind the counter handling customer requests in parallel.