You will listen to an album, then another album, then another......
All your songs or songs in the selected playlist will be shuffled by album.
If you are a user of PlayingAlbums for macOS, you will share its settings for PlayingAlbums for iPhone. You may not want to listen to songs serially of an album with multiple discs. Disc 2 is sometimes completely different from disc 1. You may be bored to listen to songs in even a single disc. Some best albums may not be necessary to listen serially. These detailed settings are available in PlayingAlbums for macOS and can be shared in PlayingAlbums for iPhone. iCloud is required for sharing settings.