A reusable building block of a user interface, like a button or card.
A component is a self-contained, reusable piece of UI in React. Each component is a Function that returns JSX — a mix of HTML and JavaScript. Components accept props (inputs from parent components) and can manage their own state using Hooks like useState.
Components are the building blocks of React apps. A page is a component. A button is a component. A navigation bar is a component. You compose complex UIs by combining simple components. Components can be exported and imported between files, nested inside other components, and tracked in routes.
In React Router, components receive data from loaders via the useLoaderData hook, display Form submission results via useActionData, and show loading states via useNavigation. If a component crashes, an Error Boundary catches the error and shows a fallback page using useRouteError. Components handle Rendering — when their state or props change, React re-renders them efficiently.
Zustand manages shared state across components, scoping keeps variables contained, and boilerplate patterns speed up component creation. Components are styled with CSS, Tailwind CSS, or CSS containers, and respond to CSS states. You can debug components using the browser console and DevTools.
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