Themes provide the HTML, CSS, JavaScript, and other assets that are responsible for the look and feel of your site.

PHP: Hypertext Preprocessor (PHP) is a popular interpreted programming language that is especially suited for web development. Drupal core and all contributed modules are written in PHP.

To ensure that your site and its modules continue to function correctly, a set of administrative operations should be performed periodically. These operations are referred to as cron tasks. Examples of cron tasks are: checking for module and theme updates, indexing content for search, or cleaning up temporary files.

Drupal provides a standard, secured method for module developers to add forms to a Drupal website. Learn how to use the Form API to build, validate, and submit a custom form.