The Drupal Form API (Application Programming Interface) is a set of functions and tools used to create and manage forms in the Drupal content management system. It provides a structured way to create, validate, and process forms in a secure and extensible manner. The Form API is an integral part of the Drupal core, and is used to create and manage forms for both the administrative and front-end user interfaces.
The Form API is a powerful tool that allows developers to create forms quickly and easily. It provides a set of functions and tools that allow developers to create forms with a variety of elements, such as text fields, checkboxes, radio buttons, and select lists. The Form API also provides a set of validation functions that can be used to ensure that the data entered into the form is valid.
The Form API also provides a set of tools for managing the form submission process. It allows developers to define how the form should be processed, including what data should be stored in the database, and how the form should be displayed to the user. The Form API also provides a set of hooks that allow developers to extend the functionality of the form, such as adding custom validation rules or adding custom submit handlers.
The Form API is an essential part of the Drupal content management system, and is used to create and manage forms for both the administrative and front-end user interfaces. It provides a powerful and extensible way to create and manage forms, and is an important tool for developers who want to create custom forms for their Drupal sites.