I believe this right here http://flask.pocoo.org/docs/deploying/uwsgi/ is a good answer to clear up the confusion. The question isnt silly, happens to anyone who sees the two terms and has no prior info on how things work outside of mod_PHP world (for e.g. nothing against php or folks)
The site does well to explain in practical terms what is needed and what is the difference as well as a good deployment example for nginx.
For the convenience, the explanation from Flask wiki is quoted here:
uWSGI is a deployment option on servers like nginx, lighttpd, and cherokee; see FastCGI and Standalone WSGI Containers for other options. To use your WSGI application with uWSGI protocol you will need a uWSGI server first. uWSGI is both a protocol and an application server; the application server can serve uWSGI, FastCGI, and HTTP protocols.
The most popular uWSGI server is uwsgi, which we will use for this guide. Make sure to have it installed to follow along.
