What are components in React?

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In React, a component is a reusable, independent building block of the user interface. Instead of writing one large UI file, React encourages splitting the application into multiple small pieces called components, where each component represents part of the UI—like a button, a navbar, a form, or even an entire page section.

Components are the heart of React’s architecture. They can be thought of as JavaScript functions or classes that return UI elements (using JSX). React then renders these components into the browser’s DOM.

There are mainly two types of components:

1. Functional Components – Simple functions in JavaScript that return JSX. They can use React Hooks (like useState, useEffect) to handle state and lifecycle features.

   function Greeting() {
     return <h1>Hello, World!</h1>;
   }
   

2. Class Components – ES6 classes that extend React.Component and include methods like render(). These were widely used before hooks, but functional components are now preferred.

Components also follow a hierarchy: larger components can contain smaller ones, making UI scalable and modular. They can accept props (short for properties) to receive data from parent components and can manage their own state to track dynamic data.

Benefits of using components:

• Reusability → Write once, use multiple times.

• Maintainability → Easier to debug and update.

• Separation of Concerns → Each component handles a specific piece of UI logic.

In short, React components are like Lego blocks—individually small and simple, but when combined, they build powerful and complex UIs.

Read more :

What is React?

What are JavaScript events?

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