Node.js JavaScript ko browser ke bahar run karne ka powerful runtime hai. Ye backend, APIs aur servers banane ke liye use hota hai. Install karne ke baad hum terminal me node -v aur npm -v se verify kar sakte hain. REPL se hum directly JS test kar sakte hain, aur .js files ko node filename.js se run kar sakte hain. Iske through simple se leke server-side applications tak easily build ki ja sakti hain 👍