React
React is an open-source JavaScript library developed by Meta for building dynamic user interfaces across web and mobile platforms. It uses a component-based structure, allowing developers to build encapsulated UI elements that manage their own state. A key innovation in React is the virtual DOM, which optimizes rendering by only updating parts of the page that change.
JSX, a syntax extension, enables developers to write HTML-like structures in JavaScript code. React supports both functional and class components, with modern development favoring hooks for managing state and effects. React apps follow a unidirectional data flow, making debugging and scaling easier. It also supports server-side rendering for better SEO and performance.
Developers can build native apps with React Native using the same concepts. React’s flexibility and ecosystem make it a leading choice for creating maintainable, high-performance user interfaces.