React, often referred to as React.js or ReactJS, is a free and open-source front-end JavaScript library for building user interfaces (UIs) based on components. It is maintained by Meta (formerly Facebook) and a community of individual developers and companies.

Key characteristics :

• Declarative : React simplifies the creation of interactive UIs by allowing developers to design simple views for each state in their application. React then efficiently updates and renders only the necessary components when data changes, making code more predictable and easier to understand and debug.
• Component-Based : React applications are built using encapsulated components that manage their own state and can be composed to create complex UIs. This modularity promotes reusability and maintainability.
• JSX : React uses JSX (JavaScript XML), a syntax extension for JavaScript that allows writing HTML-like code directly within JavaScript. This enhances readability and makes it easier to define UI structures within component logic.
• Virtual DOM : React utilizes a virtual DOM, which is a lightweight representation of the actual DOM. When data changes, React first updates the virtual DOM, then efficiently calculates the minimal changes needed to update the real DOM, leading to improved performance.
• Hooks : Introduced in React 16.8, Hooks are functions that let you "hook into" React state and lifecycle features from function components, eliminating the need for class components in many scenarios
• Versatility : While primarily known for web development, React can also be used for building mobile applications with React Native and server-side rendering with Node.js.

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