Relationships between Spring, Hibernate, JDBC

I just start reading Sun's JDBC tutorial. I installed MySQL Connector/J and was just skimming through its menu, then came across this statement:

"Although JDBC is useful by itself, we would hope that if you are not familiar with JDBC that after reading the first few sections of this manual, that you would avoid using naked JDBC for all but the most trivial problems and consider using one of the popular persistence frameworks such as Hibernate, Spring's JDBC templates or Ibatis SQL Maps to do the majority of repetitive work and heavier lifting that is sometimes required with JDBC"

So what are the relationships between Spring, Hibernate, JDBC? What does the statement mean by saying "avoid using naked JDBC"?

Thanks,

Sarah