Spring HATEOAS is a library that gives developers the ability to create REST representations that follow the HATEOAS principle in applications using Spring MVC. As the core idea of HATEOAS is to use hypertext to drive a resources' state change, the main function that Spring HATEOAS provides is link creation. It eases the creation of links by providing link builder APIs to create links that point to Spring MVC controller methods. It uses HAL as the hypermedia format of the link. Due to the scope of this book, we won't go into the details of how to use it. If you're interested, you can find tutorials on its official websites: https://projects.spring.io/spring-hateoas/.