An Informational Interview is a meeting with person employed in the career field in which you are interested. The purpose is not to obtain a job but to ask questions and learn as much as possible about the nature of the work.
Informational Interviewing Tutorial
YouTube is an excellent place to locate interviews, especially from professionals in the field.
Occupational Outlook Handbook (OOH) - Bureau of Labor Statistics
The Occupational Outlook Handbook is the government's premier source of career guidance featuring hundreds of occupations—such as carpenters, teachers, and veterinarians.