An OpenAPI file (often referred to as an OpenAPI description or specification document) is a machine-readable file that defines the structure and behavior of a RESTful API in a standardized format.
It allows developers, tools, and consumers to understand an API's capabilities—such as endpoints, operations (e.g., GET, POST), parameters, request/response formats, authentication methods, and data models—without needing access to the source code or running the API itself.
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