title: Tornado (web server)
text: # Tornado (web server)
  
  Tornado is a scalable, non-blocking web server and web application framework written in Python. It was developed for use by FriendFeed; the company was acquired by Facebook in 2009 and Tornado was open-sourced soon after.
  
  ## Performance
  
  Tornado is noted for its high performance. Its design enables handling a large number of concurrent connections (i.e., tries to solve the "C10k problem").
  
  ## Modules
  
  * An asynchronous MongoDB driver called Motor.
  * CouchDB drivers called corduroy and trombi.
  * Asynchronous driver for PostgreSQL wrapping psycopg called Momoko
  
  ## Example
  
  The following code shows a simple web application that displays "Hello World!" when visited:
  
  