What is a React component?

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A React component is a reusable, self-contained piece of UI in a React application. Components define what should be displayed on the screen and how it behaves.

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🔑 Key Points:

1. Reusable UI Building Block

   • Components can be used multiple times across the app.

   • Example: Button, Header, Footer, ProductCard.

2. Types of Components

   • Functional Components: Simple JavaScript functions that return JSX (HTML-like syntax).

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

   • Class Components: ES6 classes with lifecycle methods (less common in modern React).

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

3. Props (Properties)

   • Components can receive data from parent components via props.

   • Example: <Button label="Click Me" />

4. State

   • Components can manage internal data that changes over time.

   • Example: A counter component that increments on button click.

5. Composition

   • Components can contain other components, forming a tree-like UI structure.

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🔹 Example:

function ProductCard({ name, price }) {
  return (
    <div>
      <h2>{name}</h2>
      <p>Price: ${price}</p>
    </div>
  );
}

// Usage
<ProductCard name="Laptop" price={1200} />

• Here, ProductCard is a component that can be reused for multiple products.

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✅ In short:
A React component is a modular piece of UI that can receive data, maintain state, and be reused to build complex user interfaces efficiently.

I can also explain the difference between functional and class components if you want.

Read More

Define JSX in React.

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