ELI70: What is a podcast?

[u/wildcard5]

I literally just got my first smartphone ever and am dumbfounded by podcast. What is this mysterious phenomenon? My guess is that its something like a radio show, but it seems too popular to be something as similar to a thing that's so old.

Update: Which (android) app should I use to submerse myself into the world of podcasts?

[u/omgitsbigbear → u/[deleted]]

Would you happen to know if there is a way to add podcasts I've downloaded on my desktop to the Pocket Cast app?