Can someone explain, in layman terms, what is Object/relational mapping(ORM) in relation to Hibernate and JDBC?

Diagrams would be especially helpful for understanding...

EDIT: I found this via google for Hibernate ORM, can someone confirm that it is accurate and a good representation of how ORM is used.

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src: http://software-carpentry.org/3_0/summary.html

java hibernate orm jdbc
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