Understanding Podcast Icons
Problem: You want to subscribe to a podcast, but you are unsure of which of the subscription icons you should choose. Here is a rundown of the typical icons used by most podcasters.
Podcast RSS
 The RSS icon designates an XML feed intended for an RSS (Really Simple Syndication) feed aggregator. The RSS icon link enables quick feed subscription to an RSS feed reader, or, in the case of podcast feeds, provides a link that can be copied and pasted into a podcast receiver (or MP3 player application). This link uses the standard http protocol and is the safest option for all users because it allows the podcast to be used in applications, including iTunes
One-click iTunes Subscription
 This icon is used when the link provides a one-click subscription to the podcast through iTunes. The one-click subscription is accomplished by using a different protocol, called itpc; otherwise, it is the same URL as the RSS link. Upon selection, the link automatically points directly to the iTunes application without requiring the user to take any other steps.
(Windows Users: You must have iTunes installed to use a one-click podcast feed. If you do not have iTunes installed, this feed will fail.)
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