This module will allow Drupal to replace textarea fields with the CKEditor 4 - a visual HTML editor, usually called a WYSIWYG editor. This HTML text editor brings many of the powerful WYSIWYG editing functions of known desktop editors like Word to the web. It's very fast and doesn't require any kind of installation on the client computer.
CKEditor is the far superior successor of FCKeditor. The editor has been rebranded and completely rewritten. It is now much faster (the code has been optimized), loads faster (the number of files has been reduced, so the browser will perform less HTTP requests) and developer-friendly.