What is React

React is a JavaScript library used for building user interfaces (UIs), primarily for web applications. It focuses on building UI components—small, reusable pieces of code that define how a part of the interface should look and behave.

Core Features:
Component-Based Architecture: Build complex UIs using isolated, reusable components.

Declarative Syntax: Define what the UI should look like for any given state, and React handles rendering.

Virtual DOM: React uses a virtual representation of the DOM to optimize rendering and improve performance.

Unidirectional Data Flow: Data flows in a single direction, making applications predictable and easier to debug.

Hooks API: Use state and lifecycle features inside functional components without writing classes.