Blog / Welcome to the React documentation.

Welcome to the React documentation.

React apps are made out of components. A component is a piece of the UI (user interface) that has its own logic and appearance. A component can be as small as a button, or as large as an entire page.

Notice that starts with a capital letter. That’s how you know it’s a React component. React component names must always start with a capital letter, while HTML tags must be lowercase.

Have a look at the result:

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Welcome to the React documentation.