API documentation is a crucial technical resource that provides comprehensive details about an API's functionality, endpoints, data formats, authentication protocols, and error handling mechanisms. High-quality API documentation is essential for ensuring a positive developer experience, as it allows developers to quickly understand and integrate the API into their projects. Good documentation should be clear, organized, and easy to navigate, offering a mix of high-level overviews and detailed information, including code samples and interactive elements. Beyond aiding developers, well-crafted API documentation benefits technical writers, product managers, sales teams, and support staff by providing a solid foundation for building, showcasing, and maintaining the API effectively. It is important to distinguish between API documentation, specifications, and definitions, with each playing a distinct role in the API development lifecycle. Tools like OpenAPI can facilitate the creation of robust API documentation by standardizing the process and ensuring consistency across specifications, definitions, and documentation, ultimately enhancing the API's adoption and user satisfaction.