A podcast is the streaming age’s answer to radio. The dictionary definition of a podcast is a digital audio file you can download or listen to over the Internet. Its interesting history explains why it is called a podcast, to begin with. A podcast is the streaming age’s answer to radio. The dictionary definition of a podcast is a digital audio file you can download or listen to over the Internet. Its interesting history explains why it is called a podcast, to begin with. A podcast is the streaming age’s answer to radio. The dictionary definition of a podcast is a digital audio file you can download or listen to over the Internet. Its interesting history explains why it is called a podcast, to begin with.