OpenAPI: RESTful API Specification for Developers

OpenAPI (formerly known as Swagger) is a specification for building and documenting RESTful APIs. It allows developers to describe the endpoints, parameters, responses, and other details of their API in a machine-readable format. This makes it easier for developers to understand and use the API, as well as for tools to automatically generate client code, server stubs, and documentation. OpenAPI is widely used in the industry and is supported by many API development and testing tools.