You can define which users will be able to use each text format by selecting roles. To ensure security, anonymous and untrusted users should only have access to text formats that restrict them to either plain text or a safe set of HTML tags. This is because HTML tags can allow embedding malicious links or scripts in text. More trusted registered users may be granted permission to use less restrictive text formats in order to create rich text. <strong>Improper text format configuration is a security risk.</strong>