What is React?
React is a JavaScript library for building user interfaces. It’s focused on UI development and separates concerns – you build the components, and React manages the updates and rendering.
It uses a virtual DOM to efficiently update the UI without re-rendering the whole thing.
Key Concepts
- Components: Reusable building blocks of the UI.
- JSX: A syntax extension to JavaScript that allows you to write HTML-like structures within JavaScript.
- Props: Data passed to components.
- State: Data that controls the UI’s behavior.
- Lifecycle Methods: Functions that run at different stages of a component's lifecycle.
Why Use React?
React’s component-based approach makes it easy to manage complex UIs. It has a large and active community, and it provides a lot of libraries and tools.