What is a RAML file used for in MuleSoft?

A RAML file is specifically utilized to define an API interface in MuleSoft. It serves as a design specification for RESTful APIs, allowing developers to specify the resources, methods, and data types involved in their API. This structure facilitates clear communication regarding how the API should function, making it easier to implement and consume.

By providing a comprehensive description of API endpoints, request/response formats, and other details, a RAML file acts as a contract between API providers and consumers. This clarity helps streamline development and integration processes, ensuring that all parties have a shared understanding of the API’s capabilities and structure.

While other elements such as data schemas or documentation are essential to the overall API development lifecycle, the primary purpose of a RAML file is to articulate the API's interface itself. This distinction is what makes the choice regarding the definition of an API interface the correct one.