What React DOM Does: Bridging React Components and the Browser

React DOM is a package that serves as the link between React's component system and the browser's Document Object Model, handling how UI components are displayed on a web page. It uses a Virtual DOM — an in-memory copy of the real DOM — to compare previous and current UI states and apply only the minimal necessary changes, a process known as reconciliation. React 18 introduced the createRoot() API, which establishes a root container in the HTML document where the React application is mounted and rendered. Performance is further improved through batching, where multiple state updates are grouped into a single render cycle rather than triggering separate updates. React DOM underpins a wide range of web applications, from dashboards and e-commerce platforms to real-time tools and SaaS products.