HTML stands for Hyper Text Markup Language. HTML was developed by scientist Tim Berners-Lee in 1990. An HTML file is a text file containing small markup tags. In HTML, we use “tags” to create the structure. These tags tell the browser how to display the text or graphics in the document. HTML file must have an .htm or .html file extension. You can create HTML file using any Text Editor like Notepad or Sublime etc.