HTML is short for Hyper Text Markup Language. HTML is a language of writing web pages. HTML document contains plain text, it can be written in even the simple text editor. Such as- Notepad, Brackets and etc. A more popular choice is to use a HTML editor is WYSIWYG ("What You See Is What You Get"). Such as- FrontPage, Dreamweaver, etc. At the time of saving HTML document, you will ensure to put an .html file extension or an .htm file extension.