How the Web Works – Frontend vs Backend?

Perfect! Let’s move on to Lesson 3 of your course:

📘 LESSON 3: How the Web Works – Frontend vs Backend

✅ Learning Goals:

Understand how a website works from the moment you type a URL
Learn the difference between frontend and backend
See how HTML, CSS, and JavaScript work in the browser

🧾 Lesson Content (Text for Website)

🌐 How the Web Actually Works

Ever wondered what happens when you open a website like www.google.com?
Let’s break it down.

You type a URL into your browser
The browser sends a request to a server
The server sends back HTML, CSS, and JS files
The browser reads those files and shows the page

That’s it — the web is just a fancy system of requests and responses!

🚀 Client and Server Explained

Term	Role in Web
Client	Your browser (Chrome, Firefox)
Server	A computer that stores and sends websites
Request	Client → Server (Asks for a page)
Response	Server → Client (Sends files back)

🎨 What is the Frontend?

Frontend = everything the user sees and interacts with.

It’s built using:

HTML → structure
CSS → design
JavaScript → interactivity

🧑‍🎨 It’s like painting + engineering combined!

🧠 What is the Backend?

Backend = everything that happens behind the scenes.

It handles:

Storing and sending data
User authentication
Business logic

It’s usually built with:

Node.js, Python, PHP, Java, etc.
Databases like MySQL, MongoDB

🖼️ Visual Diagram (Add this as an image on your site)

[ YOU (Browser) ]
       ↓
  [ Request ]
       ↓
[ SERVER (Backend) ]
       ↓
[ Sends Back HTML + CSS + JS ]
       ↓
[ You See a Web Page ]

⚙️ How HTML, CSS, and JS Work Together

Imagine building a house:

HTML is the walls and rooms
CSS is the paint and decoration
JavaScript is the lights, doors, and appliances (interactivity)

All 3 work together to make a modern website.

📌 Quick Summary

The web works through a simple request-response cycle
Frontend = visible part (HTML, CSS, JS)
Backend = logic and database (runs on server)
As a frontend developer, you focus on the client side

📹 [Optional YouTube Embed Section]

👉 Embed an animation or explainer video here

🧪 Code Example: See Frontend in Action

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Frontend in Action</title>
  <style>
    h1 { color: #ff6f00; }
    button {
      padding: 10px 20px;
      background: #ff0000;
      color: white;
      border: none;
    }
  </style>
</head>
<body>
  <h1>Hello from the Frontend!</h1>
  <button onclick="alert('You clicked me!')">Click Me</button>
</body>
</html>

Try saving this as lesson3.html and open it with Live Server. You’ll see how HTML + CSS + JavaScript work together.