The OAS is to REST what WSDL was to SOAP. It provides a common framework of designers, developers, testers, and devops to build and maintain APIs. Think of the specification as a set of rules to build and implement a REST API. The OAS is language agnostic, and is both human and machine readable, which allows both people and computers to discover and understand the capabilities of a service without requiring access to source code, additional documentation, or inspection of network traffic.

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