API documentation entails comprehensive information about an Application Programming Interface, serving as a guide for developers. It includes details on available endpoints, request and response formats, and authentication methods. Good API documentation helps developers understand how to integrate and utilize the API effectively, facilitating smoother application development processes. Additionally, it often contains code examples, error messages, and versioning details. Clear and accessible documentation is vital for fostering adoption and enhancing user experience, ensuring that developers can confidently leverage the API's functionalities.