A text editor is a way to add text to websites. It’s very often used by Joomla, WordPress, and Drupal. A Text editor works similar to a standard word-processor. It’s also known as a WYSIWYG (pronounced “wiz-zee-wig”) editor and used to design web pages by adding text and graphics. Text editors take the information you enter and format it in HTML (Hyper Text Markup Language – what web pages are made from). Most text editors are included with a CMS, but there are also premium text editors that you can purchase for some content management systems.
For more information on text editors, see: http://en.wikipedia.org/wiki/Text_editor