React is a popular JavaScript library used for building user interfaces, developed by Facebook. Learning React is essential for web developers who want to create dynamic and interactive web applications. It allows developers to easily manage and update the user interface as the data changes, making applications more efficient and responsive.

By learning React, developers can create single-page applications that offer a seamless user experience. React components can be reused, making the development process faster and more maintainable. Additionally, React's virtual DOM allows for efficient updates to the user interface, improving performance and reducing load times.

Key Lesson Concepts:

• React is essential for building dynamic and interactive web applications
• React enables developers to create reusable components for faster and more maintainable development
• React's virtual DOM improves performance and reduces load times