Java Persistence API (JPA) acts as a link between Java and relational databases. As an established tool for Object-Related Mapping (ORM), JPA illustrates a collection of guidelines to make interfaces for ORM’s implementation. This shows that JPA itself doesn’t perform any function; instead, it has to be implemented by Hibernate. Being an essential ORM tool for Java, Hibernate works on structuring the framework of Java for relational databases. So while JPA initiates the guidelines and rules for implementation, these guidelines are carried out by Hibernate. While JPA uses Java persistence query language (JPQL), Hibernate uses Hibernate query language (HQL).