What's the difference between Hibernate and JPA?

Question

Can someone put in perspective the difference between JPA and Hibernate. Or are these complementary concepts, to be used together?

Answer 1

Roughly, JPA is a standard from the java community, here the specs, which has been implemented (and extended) by the Hibernate guys (some info here). Being a spec, you will not be using JPA directly, but a JPA implementation.

Beware that if you'll use the hibernate JPAs' extensions, you'll break the compatibility with other JPA implementations (though some will say "why you should use another JPA implementation?").