HTML stands for HyperText Markup Language, and is the main programming language underlying web pages. Basically it describes to browser software such as Internet Explorer, Safari, Google Chrome, Firefox, etc. how and where text and images should display.
HTML consists of a series of short codes – tags, which are typed into a text-file by the website author. The text is then saved as a html file, and viewed using a browser. The browser reads the file and translates the text into a visible form, rendering the page as the author had intended. Writing your own HTML entails using tags correctly to create your vision.