The DOM (Document Object Model) is an interface that represents how your HTML and XML documents are read by the browser. It allows a language (JavaScript) to manipulate, structure, and style your website.A DOM tree starts from the topmost element which is html element and branches out as per the occurrence and nesting of HTML elements in the document. Whenever an HTML element is found, it creates a DOM node (Node) object from its respective class (constructor function).The Document Object Model (DOM) is an application programming interface (API) for HTML and XML documents. It defines the logical structure of documents and the way a document is accessed and manipulated.