JavaScript
DOM
DOMThe browser's live, in-memory tree representation of an HTML page that JavaScript can change.
Reviewed by the RadarTrek editorial team · June 2026
The Document Object Model (DOM) is the structure the browser builds from your HTML so that JavaScript can read and modify the page after it loads — changing text, adding elements, responding to clicks. Every interactive feature on a website is JavaScript manipulating the DOM.
Why it matters
- —Without the DOM, JavaScript couldn't make any visible changes to a page.
- —Frameworks like React exist largely to manage DOM updates efficiently on your behalf.
- —DOM events (clicks, input, submit) are how user interaction connects to your code.
Where to learn this
🎓
The DOM
JavaScript Fundamentals course
This is the exact lesson that covers this term in depth — with examples, diagrams, and a hands-on exercise.