Cover Flow is the animated, 3-dimensional interface for browsing through album art on your iPod or iPhone. Cover Flow was also found within iTunes, macOS, and other Apple applications.
Cover Flow is found on the following iPods:
- iPod Classic (6/7th generation)
- iPod nano (3rd -> 5th generation)
- iPod touch (iOS 6 and earlier)
Earlier iPods (released in 2007) had some performance issues whilst running Cover Flow, but later ones suffered significantly less from the same issues.
Cover Flow within iOS was replaced by Album Wall in the release of iOS 7, and said feature completely disappeared with the release of iOS 8.4 and Apple Music.
A similar interface, PictureFlow, is available on iPods running Rockbox.
Resources
MacWorld Keynote 2007 (unveiling of Cover Flow, timestamped): https://youtu.be/VQKMoT-6XSg?t=950
US Patent for Cover Flow: https://patents.google.com/patent/USD613300
Wikipedia Entry on Cover Flow: https://en.wikipedia.org/wiki/Cover_Flow