Built-in React Components

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

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.
<Activity> lets you hide and restore the UI and internal state of its children.

You can also define your own components as JavaScript functions.