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How AI Connects to the World: A Beginner’s Guide to APIs and MCP

Every app you use is powered by APIs. Every AI agent you will build needs MCP. This guide teaches you both from scratch: what they are, how they work, why they exist, real-world use cases, and step-by-step how to use and build them yourself. By the end, you should understand the two protocols that power modern AI development. Two questions started this article: A developer at my cloud computing bo…