React is a JavaScript library created by Facebook that is used for building user interfaces (UIs) and single-page applications (SPAs). React allows developers to create reusable UI components and build user interfaces out of individual pieces called components written in JavaScript. It is a declarative, efficient, and flexible library. React uses a component-based architecture, which means that the UI is broken down into smaller, reusable pieces of code called components. This makes it easier to manage and maintain large-scale applications.
React is not a full-fledged framework like Angular or Vue.js. Instead, it focuses solely on the view layer of the application, which means that it can be easily integrated with other libraries and frameworks. React uses a virtual DOM (Document Object Model) to update the UI efficiently. When a user interacts with a React application, the virtual DOM updates first, and then only the necessary parts of the actual DOM are updated.
