HTML is an abbreviation for Hypertext-Markup Language and is used to create the structure of a website. In other words, it’s considered the skeleton.
A webpage is made up of many different types of tags that are used to structure a webpage.
HTML documents use the file extension .html and .htm. Every HTML document is started with the <html> and must end with it’s closing tag </html> (most websites use HTML5 now; to use HTML5 <!DOCTYPE html> tag is added at the top of the document before <html> tag). Within the <html> tag we have two more tags that are required. You’ve got <head></head> and then <body></body>, the <head> tag will consist of your site information such as it’s title and meta details, it is also used to link other documents. Following after <head> tag, we have the <body> tag; the body tag is everything that you see on a webpage; e.g. this will include anything visual, text, images etc. You need a body tag to display content to your webpage.
HTML works with other coding and programming languages as well, some of which you may have heard about – CSS, Cascading Styling Sheet, JavaScript.
Edit: Remember think of HTML like the building blocks of a website. Most HTML elements are displayed as blocks or boxes.