[ manual entry ]:
Historically, Hibernate facilitated the storage and retrieval of Java domain objects via Object/Relational Mapping. Today, Hibernate is a collection of related projects enabling developers to utilize POJO-style domain models in their applications in ways extending well beyond Object/Relational Mapping.
software packages are referencing this project.
This project is a Rockstar! If that many other packages are referencing it, it must be good and useful.
As a Java dev you should know this project.