The filter module allows administrators to configure text input formats for use on your site. An input format defines the HTML tags, codes, and other input allowed in both content and comments, and is a key feature in guarding against potentially damaging input from malicious users. Two input formats included by default are <em>Filtered HTML</em> (which allows only an administrator-approved subset of HTML tags) and <em>Full HTML</em> (which allows the full set of HTML tags). Additional input formats may be created by an administrator.