iam a leaning hibernate. i have one small doubt
[b]what is ORM &jdbc is there why do we use hibernate

ORM simply means Object-Relational-Mapping, that is, the process of mapping your Java objects to a relational database.

JDBC is the underlying communication mechanism Java programs use to communicate with the database.

Hibernate simplifies the process of ORM, hiding the complexities of JDBC, and making the mapping process easier.