Tornado is a scalable, non-blocking web server and web application framework. It was developed for use by FriendFeed, which was acquired by Facebook in 2009 and Tornado was open-sourced soon after.
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Pro Designed for performance
Tornado can scale to several open connections at the same time. This makes it perfect for applications where performance is very important.
Pro Amazing asynchronous functionalities
Con It's usually useful only when building real-time web applications
Because it's basically a framework for building real-time applications it has great support for things like WebScokets and uses non-blocking I/O. But it lacks in features that are used to build general-purpose websites like blogs, e-commerce sites, web portals etc...
For example it lacks ORM integration (at least out of the box) and it doesn't have a very powerful template engine.