Components in React

What is a Component?

• A component is simply a JavaScript function that returns JSX.

Example:

function Welcome() {
  return <h1>Hello World</h1>;
}

Here:

• Welcome is a component.
• It returns an <h1> element.
• React renders the returned JSX on the screen.

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Why Do We Need Components?

Without components, we would have to write the same code repeatedly. Components help us:

• Reuse code
• Keep code organized
• Improve maintainability
• Build complex UIs easily

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Types of Components

1. Functional Components

Modern React mainly uses functional components.

function Greeting() {
  return <h1>Hello Raksha</h1>;
}

2. Class Components

Older React applications used class components.

class Greeting extends React.Component {
  render() {
    return <h1>Hello Raksha</h1>;
  }
}

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Reusability of Components

A component can be used multiple times.

function Welcome() {
  return <h1>Welcome!</h1>;
}

function App() {
  return (
    <>
      <Welcome />
      <Welcome />
      <Welcome />
    </>
  );
}

Output:

Welcome!
Welcome!
Welcome!

This demonstrates the reusability of components.

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Real-World Example

Imagine building a portfolio website.

Instead of writing everything in one file, create separate components:

• Header Component
• About Component
• Skills Component
• Projects Component
• Contact Component
• Footer Component

Then combine them inside App.jsx.

function App() {
  return (
    <>
      <Header />
      <About />
      <Skills />
      <Projects />
      <Contact />
      <Footer />
    </>
  );
}

This makes the project cleaner and easier to maintain.

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