The article provides a detailed introduction to the use of OpenAI API, covering various types of interfaces such as conversational, private model building, general, and image-audio interfaces. The conversational interface is designed for human-computer interaction, while the private model building interface is used to construct personalized models. It also introduces the request parameters and return results for each interface, along with code examples. The article comprehensively covers the functionalities and usage of the OpenAI API, making it suitable for beginners to learn and utilize.