1. React: Building interfaces from reusable pieces

A React component is a focused piece of an interface, such as a search box, product card, profile menu, or navigation bar. Components can be combined, reused, and customized, turning a large application into a collection of understandable building blocks.

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Typing in a form, opening a menu, or adding an item to a cart changes the state of an application. React connects that state to the screen so the interface can respond consistently when data or user actions change.

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React appears in ordinary web experiences: streaming pages, online stores, admin dashboards, collaborative tools, and mobile-style web apps. Its component model also encourages teams to share design patterns and create consistent interfaces across many screens.

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React can lead to many kinds of hands-on work, including accessible websites, data dashboards, design systems, interactive visualizations, and full-stack applications. Developers may contribute components to open-source communities or collaborate with designers and backend engineers to shape complete products.

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