what is credentialing and why do we credential providers?

1) what is credentialing and why do we credential providers?
2) what do healthcare organization do?
what are the types of ownership status for a healthcare organization? How is the mission of healthcare different that the mission of other organizations?
3) in general what is the purpose of leadership? what makes a good leader? what is the purpose /role of leadership in healthcare? What aspects of cultural leadership do you most identify with and why?