APIs are everywhere. Every time you book a ride, check the weather, log into an app, or make a payment online—an API is working behind the scenes. But despite how common they are, many people still find APIs confusing. What are they? How do they work? And why are they so important in modern software? This guide will break everything down in simple terms. You’ll learn what an API is, how it works, how API testing fits in, and how developers and testers use APIs to build reliable systems. What Is an API? An API (Application Programming Interface) is a way for different software systems to communicate with each other . Think of it like a waiter in a restaurant: You (the user) place an order The waiter (API) takes your request The kitchen (server) prepares the response The waiter delivers the result back to you You don’t need to know how the kitchen works. The API handles everything. Why APIs Exist Modern applications are complex. Instead of building everything from scr...
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