What is an API?

An API (Application Programming Interface) is a set of rules that allow one software application to communicate with another. In modern web development, APIs are the backbone of system integration.

The Waiter Analogy

Imagine you are in a restaurant:

• You (Client): Want to order food.
• Kitchen (Server): Where the food is prepared.
• Waiter (API): Takes your order to the kitchen and brings the response (your food) back.

Without the waiter, you would have to enter the kitchen and know exactly how everything works inside. The API simplifies this interaction.

Why use APIs?

1. Abstraction: You don't need to know how the server is implemented.
2. Security: The server controls what it exposes and who can access it.
3. Reuse: A single API can serve a website, a mobile app, and third-party integrations.