react.dev/src/content/reference/react/apis.md

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Built-in React APIs

In addition to Hooks and Components, the react package exports a few other APIs that are useful for defining components. This page lists all the remaining modern React APIs.

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• createContext lets you define and provide context to the child components. Used with useContext.
• forwardRef lets your component expose a DOM node as a ref to the parent. Used with useRef.
• lazy lets you defer loading a component's code until it's rendered for the first time.
• memo lets your component skip re-renders with same props. Used with useMemo and useCallback.
• startTransition lets you mark a state update as non-urgent. Similar to useTransition.