What is API documentation?

API documentation serves as a comprehensive guide for developers and users on how to effectively use and interact with an API (Application Programming Interface). It includes detailed explanations about the available endpoints, request and response structures, authentication methods, and examples of how to implement various functions and features within the API. This information is essential for developers to understand the capabilities of the API, integrate it into their applications, and troubleshoot any issues they may encounter during implementation.

The emphasis on understanding and integration is what sets this choice apart from the others. While installation procedures, error summaries, and promotional content can be relevant in different contexts, they do not encompass the full scope of what API documentation is intended to provide. API documentation focuses on practical use, making it an essential resource for anyone looking to leverage the API in their development work.