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

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Built-in React Components

React exposes a few built-in components that you can use in your JSX.

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Built-in components {/built-in-components/}

• <Fragment>, alternatively written as <>...</>, lets you group multiple JSX nodes together.
• <Profiler> lets you measure rendering performance of a React tree programmatically.
• <Suspense> lets you display a fallback while the child components are loading.
• <StrictMode> enables extra development-only checks that help you find bugs early.

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Your own components {/your-own-components/}

You can also define your own components as JavaScript functions.