React is a JavaScript library by Meta for building user interfaces from components — reusable, self-contained pieces of UI. It powers Facebook, Instagram, Netflix, and most Indian startups' frontends.
The core idea
function StudentCard({ name, cgpa }) {
return (
<div className="card">
<h3>{name}</h3>
<p>CGPA: {cgpa}</p>
</div>
);
}
// use it like an HTML tag: <StudentCard name="Priya" cgpa={8.9} />Instead of manually updating the DOM, you describe what the UI should look like for any state — React updates the page when state changes.
Why the job market cares
- Most in-demand frontend skill in India — check any job portal
- React devs earn 20–40% more than jQuery/vanilla-only devs
- Same knowledge extends to React Native (mobile) and Next.js (full-stack)
When to start
After you are comfortable with JS fundamentals: functions, arrays, destructuring, async. Jumping early is the #1 reason people find React "hard". Check yourself against our Complete JS Guide, then hit the React interview questions.