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Carousel 0:32
A 32-second explainer of Carousel, narrated over the same demo you can try yourself.
Try the interactive Carousel demo
What this video covers
A carousel displays a sequence of panels in one slot, one at a time, with the rest hidden until you navigate forward or they rotate. It saves space but at a cost: almost everything beyond the first panel goes unseen, because most people never advance and auto-rotation moves on before they engage.
You only reached the later panels because you chose to click through. In the wild hardly anyone does - so the "Sale" you found on panel three was, in effect, invisible. The carousel didn't save space; it hid most of its own content.