React is a JavaScript library used for building user interfaces. It is a declarative, efficient, and flexible JavaScript library for building user interfaces. It is used for creating single-page applications and mobile applications, as well as for creating complex user interfaces.

For example, when building a web page, React can be used to create components that can be reused throughout the page. React components can be used to create interactive elements such as buttons, menus, and forms. React also allows developers to create reusable components that can be used across multiple web pages. This makes it easier to maintain and update code, as well as reducing development time.

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