The document discusses using podcasts and iTunes U. It defines a podcast as an audio or video file that can be downloaded through subscription in iTunes. When a new podcast episode is available, iTunes will automatically download it. The document also explains that iTunes U is part of the Apple Store and hosts NCSU content, including the TechKnowTalk podcast. It describes how podcasts can be used for training, talk shows, audio tours and books. Content creators can use free tools like Audacity to record audio and host it on the NCSU iTunes U site or elsewhere using iTunes U or RSS feeds.