Technology Videos

What an API Actually Does

The video explains that an application programming interface (API) is the conduit through which software interacts with large language models, whether the model is proprietary, open‑weight, or open‑source. When a developer sends a prompt, the API forwards it to the provider’s servers, the model generates a completion, and the API returns that text to the calling app. This request‑response cycle isolates the heavy computation from the client. The presenter likens the process to ordering food via a delivery app and cites ChatGPT in a browser as a concrete example: the user’s query travels to OpenAI’s servers, the model crafts a reply, and the answer appears on screen. Even locally hosted models are typically exposed through an API to simplify integration. Understanding this pattern is crucial for developers because it dictates latency, cost, security, and scaling considerations; choosing or building an API layer becomes a primary architectural decision for any AI‑powered product.