HTML
HTML (Hypertext Markup Language) is any markup language for that W3 Consortium defines as a standard for marking-up web documents.
HTML is one of three web languages that complement each other. Among these three, (a) HTML is used to mark up a webpage, (b) Cascading Style Sheets (CSS) is used to provide multiple webpages of one or more websites with a single source of truth for their graphic elements, and (c) a programming language, JavaScript (JS), is used to create everything, especially multimedia features, that the first two languages cannot create.