What is Callback Hell?

Callback Hell (also called "Pyramid of Doom") is a situation where callbacks are nested within callbacks multiple times, making code difficult to read, maintain, and debug.

Real-Life Example: Zomato App Workflow

1. Place Order

• User adds items to cart (Pizza, Biryani, Coke)
• Redirected to payment gateway
• After 3 seconds, payment is confirmed
• Order gets placed

2. Prepare Order

• Restaurant receives notification to start preparation
• After 3 seconds, food is prepared
• Token number is assigned for pickup

3. Pickup Order

• Delivery person gets notification
• Goes to restaurant location
• Picks up order using token number

4. Deliver Order

• Delivery person travels to customer location
• After 3 seconds, order is delivered successfully