The Text format dropdown is used for selecting the filter that will be used when entering text. Security is a constant concern on websites that accept entry from users, as some bad actors will attempt to enter markup that can cause havoc. Filtering which type of markup is allowed helps to mitigate the potential for trouble. These filters can be defined and configured, and the configuration will, for example, identify which HTML tags will be allowed and which processes will be run (such as HTML correction) and in which order. Filters are assigned to user roles, and a user role can have access to more than one filter. The filters that are included with Drupal and their default configurations are as follows:

• Plain text: No HTML tags will be accepted
• Restricted HTML: A minimal set of HTML such as italics, bold, and headings are typically used for anonymous users (users who are not logged in)
• Basic HTML: Similar to Restricted HTML, but usually inclusive of a configuration for WYSISYG toolbar buttons, since the filter is normally used for authenticated (logged in) users who will have access to the editor
• Full HTML: Allows any valid HTML tag, and should be assigned with care

 This filter will not be included in the dropdown as it is used when no other filters are available.