What Is an API and How Does It Work?
About this lesson
What is an API? Learn exactly how APIs work, from request and response to versioning and deprecation, with real production code explained step by step. APIs are the connective tissue of modern software, and right now they are impossible to ignore. On June 1, 2026, developers moved GPT-5.5 from OpenAI's servers to Amazon Bedrock by changing a single base URL in their code. Same SDK, same method calls, same response structure. That one-URL swap is a live demonstration of what a well-designed API actually does: it keeps the interface stable while the implementation underneath can move anywhere. This video breaks down the client-server contract, the anatomy of an HTTP request and response, how API versioning works in production, and why APIs deprecate over time. In this video: - What an API is and the client-server contract explained simply - The four parts of an API request: method, endpoint, headers, and body - Reading a real API response: status codes and JSON data - How Stripe, GitHub, and Amazon Bedrock use versioning and headers - Why APIs deprecate and what that means for your code Subscribe to Webronaq for clear, practical lessons on computer science, AI, and software engineering: https://www.youtube.com/@Webronaq #whatisanAPI #APItutorial #webdevelopment #softwareengineering #Webronaq
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