A PODCAST is a contraction between two concepts : the ipod and the broadcasting.
It's a multimedia file distributed over the Internet. A podcast is genraly free and you can download a podcast in all sites which propose that, or you have platerform for that like Itunes.
The last podcast that I have download is the videoclip of Kamini, a "singer" that he haad a big successfull with the transmission in Internet. Nowadays, he is like a star !
But podcast isn't only for the music's world! It's for all subjects : cinema, books, amaters video, tutorials... etc.
It's very practice when yu van't transporte your Mac or PC, you have in your Ipod, your own tuturial for improve your level in Photoshop for exemple! The Team of "Frenchstudio" is very nice, I think.
