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What is a podcast
From Multimedia Production ReferenceiPod, which is where the name originated, but any MP3 player will work and/or a computer with speakers is all that is really needed. All that is really needed is Apple’s music player and music store, iTunes.
Many listeners choose to have this content automatically added to their iPod/iPhone, which is where the name originated, but any Mac or Windows computer with speakers is all that is really needed. Brock University makes use of Apple's iTunesU service, which Apple makes available to universities for free.
Content delivered this way can be limited to members of the Brock University community only or be on an equal footing as institutions like CBC, BBC, TVO and NPR and other universities like Stanford, Duke, MIT and Queens.
The Centre for Teaching, Learning and Educational Technologies is the lead department responsible for iTunes U's role at Brock University and provides support for delivering content through iTunes U as they do with Brock's Sakai-Based LMS Sakai.
 Podcast Content
The content of podcasts can either be in an audio-only format or in an audio/video format. Audio files are simpler to produce, faster to download, and easier for the listener to integrate into the rest of their life, but video can convey a lot more information.
Audio podcasts can be recorded by almost anything electronic with a microphone that and create an MP3 or AAC file. Video can be from a screen or captured on a camera like a digital video camera, a web cam or similar device. Screen captures or Screencasts of an instructor narrating their actions on screen or presenting a PowerPoint presentation or Apple Keynote presentation are very well suited to podcasting.