Audio podcasting involves reporting news and information through sound files that can be distributed online and on mobile devices. A podcast is an audio file that users can subscribe to for automatic delivery of new episodes. There are over 150,000 podcasts covering every topic available on platforms like iTunes. Podcasts offer an inexpensive way for anyone to become a broadcaster and provide content on their areas of interest to dedicated audiences. While similar to radio in some ways, podcasts differ in that they are not constrained by time or broadcast regulations, allow for on-demand listening, and reach much wider audiences through digital distribution.