React.js, commonly referred to as React, is an open-source JavaScript library used for building user interfaces (UIs) and web applications. It was developed by Facebook and is now maintained by Facebook and a community of individual developers and companies.

React uses a component-based architecture, which means that complex UIs can be broken down into smaller, reusable pieces called components. These components can be easily reused across different parts of an application, making development more efficient and maintainable. React also uses a virtual DOM (Document Object Model), which allows it to update only the parts of the page that need to be changed, making it faster and more efficient than other frameworks.

To learn React, it is recommended to have a strong foundation in JavaScript and HTML/CSS. Some key concepts to understand when learning React include: components, state and props, JSX syntax, lifecycle methods, and React router.

There are many resources available for learning React, including official documentation, online courses, tutorials, and books. It is recommended to start with the official documentation, which provides a comprehensive guide to React and its features. From there, you can explore other resources and build your own projects to gain hands-on experience with React. Visit Us: React JS Course in Chennai