The Document Object Model (DOM) acts as an interface between web pages and JavaScript. It transforms HTML into a tree of objects that scripts can manipulate dynamically. This bridge allows developers to modify content, styles, and structure in real time.

Modern web interactivity relies on the DOM's ability to link HTML, CSS, and JavaScript. Developers use methods like getElementById, querySelector, and getElementsByClassName to access elements. These tools let them build dynamic user interfaces that respond to user actions without reloading the page.

Understanding DOM manipulation remains essential for frontend developers. New frameworks like React abstract much of this work, but core DOM APIs still power these abstractions. Mastery of direct DOM interaction helps debug performance issues and optimize rendering paths effectively.