Swagger in Spring Boot is an API documentation and generation tool that provides a way to visually represent, interact with, and document RESTful APIs without needing manual documentation.
Swagger provides developers with a user-friendly interface (the Swagger UI) that enables them to explore API endpoints and input/output parameters, as well as execute requests directly from it.
In Spring Boot, it can be integrated using either the springfox or springdoc-openapi libraries alongside relevant annotations in their code to describe API operations and models. Swagger makes API development faster while improving collaboration and understanding among developers and consumers of APIs alike.