HTML (HyperText Markup Language) is a standard markup language used to create web pages. It is used to define the structure and content of web pages, and it is the foundation of the modern web.

HTML consists of a set of tags and attributes that are used to define the content and structure of a web page. For example, the <p> tag is used to define a paragraph of text, and the <h1> tag is used to define a heading. HTML tags are usually written in pairs, with an opening tag and a closing tag, and the content of the tag is placed between the opening and closing tags.

HTML also allows developers to add interactivity to web pages using JavaScript and to style the content of a web page using CSS (Cascading Style Sheets).

Overall, HTML is a fundamental part of the modern web and is used by developers to create and structure the content of web pages. It is a widely used and well-established language that has evolved over time to meet the changing needs of the web.