Built-in React Components
React exposes a few built-in components that you can use in your JSX.
<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.
Your own components