From the documentation itself -
Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.
It’s basically a minimalistic web framework which supports non-blocking network operations. If you go through the list of modules it supports, you’ll see that it has a lot of modules built in. But there is no proper tutorial of how to achieve most of the things. All the reference to the API is there though. So you must go ahead, read the API and figure out things yourself.
