Here is a video titled “Podcasting in Plain English” from Commoncraft.  They are famous for their three minute video presentations to help educators and influencers introduce complex subjects.

What is Podcasting?
Podcasting is a type of online media delivery. You create audio files and then publish the selected files via the internet and allow your users to subscribe via an RSS feed to automatically receive new files. Podcasting lets you create your own syndicated online talkshow or radio program, with content of your choosing.

Taken directly from:

“Podcasting in Plain English” introduces the differences between broadcasting shows and making shows available for download on the Internet so that they can be enjoyed at any time. The video includes:

How podcasts differ from TV and Radio
What’s needed to publish and subscribe to a podcast
How podcasting democratizes media
A real world example of podcasting in practice

This is a a simple, 3 minute video explaining Podcasting.