PODCAST
A Podcast is an MP3 or other audio file delivered off a Web site via a RSS feed.
Podcast is derived from, the terms "iPod" and "broadcast".  It is attributed to the original creator of podcasting who used iPods to listen to their RSS boradcasts.  Then Apple added an RSS reader to the iTunes software, making it simple for anyone with an iPod to subscribe and listen to podcasts.  All you need to know is the URL of the RSS or XML.

If your library did a podcast of their storytime activity it would be available for your child to view again if they particularily enjoyed a session.