react.dev/src/content/reference/react-dom/index.md

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React DOM APIs

The react-dom package contains methods that are only supported for the web applications (which run in the browser DOM environment). They are not supported for React Native.

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APIs {/apis/}

These APIs can be imported from your components. They are rarely used:

• createPortal lets you render child components in a different part of the DOM tree.
• flushSync lets you force React to flush a state update and update the DOM synchronously.

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Entry points {/entry-points/}

The react-dom package provides two additional entry points:

• react-dom/client contains APIs to render React components on the client (in the browser).
• react-dom/server contains APIs to render React components on the server.

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Deprecated APIs {/deprecated-apis/}

These APIs will be removed in a future major version of React.

• findDOMNode finds the closest DOM node corresponding to a class component instance.
• hydrate mounts a tree into the DOM created from server HTML. Deprecated in favor of hydrateRoot.
• render mounts a tree into the DOM. Deprecated in favor of createRoot.
• unmountComponentAtNode unmounts a tree from the DOM. Deprecated in favor of root.unmount().