What is OAS3?

OAS3, or OpenAPI Specification version 3, is a widely adopted standard for describing and documenting RESTful APIs. It allows both humans and machines to discover and understand the capabilities of an API without requiring access to source code, additional documentation, or network traffic inspection. It's commonly used to define API endpoints, request and response structures, authentication methods, and other relevant metadata in a machine-readable format (YAML or JSON). This enables automated tasks such as generating server stubs, client SDKs, and API documentation.