HTML is the standard language used to create web pages. It's the most basic building block used in website development. HTML stands for HyperText Markup Language. It creates structured data by denoting where elements such as paragraphs, headings, links and lists should appear. HTML is a specialist language that can take time to learn, which is why many website platforms use a graphical user interface that renders the document rather than showing the code, so that authors don't need an in-depth knowledge of HTML.
Find out more about how developers might use HTML here.