Your question is API Explanation. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Explain what an API is.
Describe the concept in practical terms, using a concrete example such as a REST API request. Clarify what the API contract contains and how a client and server use it. Keep the answer focused on general software APIs and HTTP-based REST APIs, without discussing a specific company or product.