A text editor is software (typically, a JavaScript library) that provides buttons and other command mechanisms to make editing HTML text easier. Some editors are called <em>visual</em> or <em>WYSIWYG (What You See Is What You Get)</em> editors; these editors hide the details of HTML from the user, and instead show formatted output on the screen. The core Text Editor module provides a framework for deploying text editors on your site. The core CKEditor module provides CKEditor, which is a widely-used JavaScript WYSIWYG editor that creates clean and valid HTML; the module also enforces the HTML tag restrictions in the associated text format. Various contributed modules provide other editors; to install a new editor, besides installing the module, you may need to download the editor library from a third-party site.