Why is it so hard to figure out what nurse practitioners actually do? It's really not that hard. Pick up a telephone and call one if you really want to know. You can google the question and be brought to several sites, including mine, that can explain what we do and how to become one if you want.
The following is the explanation that Top Colleges.com has come up with for a nurse practitioner.
A nurse practitioner is an RN who has undertaken further training (such as a Masters degree) to provide similar care as a doctor (such as carrying out the same sort of non-emergency tasks that a physician may perform). In many states, nurse practitioners are able to write prescriptions for patients.
Go on over and leave a comment here and give your explanation like I did. Maybe they will change their definition.