DOC, or Document Object Model, is a programming interface that represents documents in a structured way. It allows developers to manipulate the content, structure, and style of web pages using languages like JavaScript. The DOC provides a tree-like structure where each element of the document, such as headings, paragraphs, and images, is represented as a node. The DOC is essential for creating dynamic web applications, as it enables real-time updates to the content displayed on a page without needing to reload it. This interactivity enhances user experience and is a fundamental aspect of modern web development, often used in conjunction with frameworks like React and Angular.