haha it's okay, i'm new at this too..
but a podcast is sort of like a radio show that you can download onto your itunes [that's what i use anyway] and you subscribe to them and every time they have a new episode, you can update and the episode downloads to your itunes. that wasn't the best description, sorryy!
but a lot of shows and fans have podcasts, like spring awakening has one, rent has one and the american theatre wing does also.. and probably a million more. they give you performances, interviews and inside information. i think it's pretty nifty, i'm such a theatre bum i love all of it!
but if you want more info, i'd say google it.
=)
hear my song; it was made for the time when you don't know where to go, listen to the song that i sing, you'll be fine..