Understanding Carousel starts with 3 words: channels, zones & bulletins.
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Channels
Your entire display is a channel.
A channel is everything that you see up on your display when it is turned on. All of the content you build is displayed on a channel.
Zones
Channels are broken up into 1 or more zones.
Zones are individual areas on your channel that you can put your content in. Users build content for specific zones.
Bulletins
Zones are placeholders for 1 or more bulletins.
Zones contain many different bulletins made up of important messages, audio, video, images and alerts. Bulletins are the actual visual elements that you put on the display for all to see.