What is Twig? How will it change Drupal themes? Drupal 8 is coming with lot of improvement in theme layer. Twig is a template engine and easy to learn. Twig is help to create template without knowledge of PHP. Twig is part of the symfony2. It created by SensioLabs. The changes in classes and arrays combined to attribute object. In Drupal 8 .tpl.php file is replaced by *.html.twig template files.