Input Format is a feature in Drupal CMS that allows users to control the type of content that can be added to a website. It is used to restrict the type of HTML tags and attributes that can be used in a text field. This helps to ensure that the content is secure and does not contain malicious code. Input Format also helps to ensure that the content is properly formatted and displayed correctly on the website.

Input Format is typically used in conjunction with a text editor, such as the WYSIWYG (What You See Is What You Get) editor. This allows users to easily create and format content without having to manually enter HTML tags. The Input Format feature can be used to restrict the type of HTML tags and attributes that can be used in a text field, as well as to limit the number of characters that can be entered in a text field.

Input Format is an important feature in Drupal CMS as it helps to ensure that the content is secure and properly formatted. It also helps to ensure that the content is displayed correctly on the website. By using Input Format, users can easily create and format content without having to manually enter HTML tags.