Swagger is an open source technology that allows developers to build, document, and consume RESTful APIs. It provides a framework for creating powerful and secure APIs that can be used by developers and other stakeholders in a collaborative environment. Swagger is a great tool for streamlining the development process, as it allows developers to quickly create and consume APIs in a standardized way. The Swagger UI also provides a great way for developers to interact with and visualize the structure of their APIs. With Swagger, developers can easily build secure, efficient, and well-structured APIs that are easily consumed and understood by other stakeholders.