Podcast is a combination of "pod" for Portable on Demand, and "cast" for broadcast. Initially podcasts were created so individuals could distribute their own radio type shows. Podcasts vary in length and are now used in the distribution of music, audio/video tours, public safety messages and most importantly education.

Health WorldNet has divided podcasts into some of the more common categories including a special section for Health Professionals.  For additional podcasts go to Find a Podcast which contains directories and links that cover multiple topics in the world of health and medicine.