Definition: The Symfony framework is one of the best-known professional PHP frameworks, which is used as the basis for developing web applications and follows the model-view-controller approach. Symfony can be downloaded from the Internet free of charge and used for both private and commercial projects.
The developers of Symfony distribute it under the MIT license. Symfony is now considered mature and offers a wealth of features. Some of them make development based on Symfony particularly convenient. A direct competitor to Symfony based on PHP is, for example, Zend Framework.
Further references:
https://de.wikipedia.org/wiki/Symfony
http://t3n.de/magazin/anwendungsentwicklung-symfony-tutorial-einstieg-219978/
The following video provides an introduction to the basic installation of Symfony:
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