Podcasts and webcasts

A podcast is a series of digital media files that are available for download by using a specific application such as iTunes, or Winamp. They will automatically gather information that is part of the podcast once it has been made available for download.
A webcast is different from a podcast because the data that is being transmitted is live and the user is viewing in real-time. A webcast is basically like a T.V. channel in other words. Here is a link to many of the recorded webcasts made a CERN, one of the leading groups for technology with physics, https://webcast.web.cern.ch/webcast/index.php
Here is the usual symbol for a podcast courtesy of Flickr.com