The OpenAPI Initiative (OAI) is a consortium of industry experts who have come together to standardize the way APIs are described and presented, with the aim of simplifying the creation and consumption of APIs.

OpenAPI Specification is a widely adopted industry standard for defining APIs. It allows developers to describe and document APIs in a standardized way.

REST APIs (Representational State Transfer APIs) use HTTP requests to access and manipulate data and allow integration between different systems and technologies.