HTML, or Hypertext Markup Language, is the fundamental language used by web developers to create and structure the content of web sites.
It is used to organize and tag the various elements of a web page, such as text, images, videos, links and other multimedia elements. Each element is defined by specific HTML tags, which tell the browser how to display and present that content.
In addition to defining the basic structure of a web page, HTML also provides a set of attributes that allow you to customize the appearance and behavior of elements. These attributes include such things as the size of an image, the color of a text or the address of a link.
HTML works in conjunction with other web languages and technologies, such as CSS (Cascading Style Sheets), to style and design HTML elements, and JavaScript, to add interactivity and dynamic functionality to a web page.