The Filter module manages the filters and input formats that it and other modules define. As explained in Chapter 2, filters process all content before it is displayed in the browser. They can do interesting things such as prevent unwanted or dangerous code or scripts from being executed, parse wiki syntax or other forms of markup, convert line breaks to HTML <br> tags, and detect e-mail addresses or URLs in the text and convert them into hyperlinks.
The Filter module is a required module and is enabled automatically. You can configure it by selecting administer > input formats (admin/filters). Configuring this module was covered in Chapter 2.
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