The Render API is a Drupal system that allows developers to easily create and manipulate HTML output. It is a powerful tool that allows developers to create and modify HTML elements, attributes, and classes, as well as add JavaScript and CSS. The Render API is a key component of Drupal's theming system, and is used to create and modify the HTML output of a Drupal page.

The Render API is composed of two main components: the Render API and the Theme API. The Render API is responsible for generating the HTML output of a page, while the Theme API is responsible for applying the theme to the HTML output. The Render API is used to create and modify HTML elements, attributes, and classes, as well as add JavaScript and CSS. The Theme API is used to apply the theme to the HTML output.

The Render API is a powerful tool that allows developers to create and modify HTML elements, attributes, and classes, as well as add JavaScript and CSS. It is also used to create and modify the HTML output of a Drupal page. The Render API is a key component of Drupal's theming system, and is used to create and modify the HTML output of a Drupal page.