Declarative, efficient, and flexible JavaScript library.

React.js is a popular JavaScript library for building user interfaces. Developed and maintained by Facebook, React is widely used for creating single-page applications where user interfaces need to be interactive and dynamic. React allows developers to build reusable UI components, making it easier to manage and maintain complex user interfaces.

• State and Props: React components can have state, which represents the internal data of the component.
• Lifecycle Methods React components have lifecycle methods that allow developers to execute code at various stages of a component's life,
• React Hooks: Hooks are functions that allow functional components to use state and lifecycle features without needing a class.
• Component-Based Architecture: React follows a component-based architecture, where the UI is broken down into independent, reusable components.