React is the most popular JavaScript library for building user interfaces. Created by Facebook (Meta), it introduced the concept of 'components'—reusable pieces of code that manage their own state. This revolutionized web development, moving it away from messy HTML/jQuery soup to structured applications.
It has a massive ecosystem (Next.js, Remix) and a huge job market. If you are building a modern web application, dashboard, or social network, React is the default choice.
Key Highlights:
- Component-Based: Build complex UIs from small, isolated pieces.
- Virtual DOM: Efficient updates make apps feel instant.
- React Native: Use the same skills to build mobile apps for iOS and Android.
Verdict: The essential library for modern frontend development.
Frequently Asked Questions
Is it a framework or library?
React defines itself as a library. However, frameworks like Next.js are built *on top* of React.
