What are components in React?

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In React, components are the building blocks of the user interface. A component is a reusable, self-contained piece of code that describes a part of the UI. Components can be functional or class-based, but most modern React code uses functional components with hooks.

Each component accepts props (short for "properties") as input and returns React elements that describe what should appear on the screen. Components can be nested, meaning one component can render another, allowing for modular, maintainable code.

There are two main types of components:

1. Functional Components – These are JavaScript functions that return JSX (a syntax extension for HTML in JavaScript). They are simple and support hooks for managing state and side effects.

2. Class Components – These use ES6 classes and include lifecycle methods. They were commonly used before hooks were introduced in React 16.8.

Components have a state (for tracking data that changes over time) and lifecycle methods or effects (for running code at specific points in the component’s life).

In summary, components in React are essential for creating dynamic, interactive UIs. They allow developers to break down complex interfaces into smaller, reusable parts, improving readability, testing, and maintenance.

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