What is the difference between getting an associates degree in nursing and going to a trade school for nursing?

My best friend has been going to a community college for years now and just got accepted/ started in the nursing program there. In two years she will have completed what it takes to have her associates in nursing. I see all of these ads for Career Care Institute and other “trade schools” for nursing. What is the difference? I know that both don’t compare to having your bachelors and it seems like community college takes so much more time. Anyone have any answers?