Podcast is any digital (mostly Audio or video) on-demand content (talk, interviews, conversation) uploaded on internet as episodes for people to download on their device for streaming online or listening offline.
Apple reported reaching 1 billion podcast downloads on its platform iTunes in 2013. Several studies are showing constant annual growth of podcast listeners. The popularity of this medium is on the rise with launch of products like Amazon Echo, Apple Carplay, Android Auto making it easier for consumers to consume podcasts like never before. Facebook has recently rolled out voice status update to some users for trial. These all indicates the on-demand audio industry is headed for some greater good.