HTML is short for HyperText Markup Language, the authoring language used to create documents on the World Wide Web. This area covers editors that modify/create web pages using a WYSIWYG (What You See Is What You Get) interface. This means that to build pages one doesn't need to manually edit raw HTML. Instead one builds pages based on visual elements like images, links, etc. Some of these editors will show the HTML source and support editing in either Source or WYSIWYG mode.