React.js
React.js is an open-source JavaScript library developed by Meta (Facebook) for building user interfaces, especially Single Page Applications (SPAs).
Instead of updating an entire webpage, React updates only the parts that change, making applications much faster and more efficient.React is widely used because it simplifies the development of large applications.
Key Features
- Component-Based Architecture
- Virtual DOM
- Declarative UI
- One-Way Data Binding
- Reusable Components
- Strong Community Support
- Rich Ecosystem
Component-Based Architecture
React applications are built using components.
Example:
Header
Sidebar
Content
Footer
Each component:
Can be reused
Has its own logic
Can receive data
Can manage its own state
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