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App...Store Quickview lets you hover the cursor over an app, album, podcast, etc. to view its description on the side. You no longer have to go back to the list after viewing each item, you can quickly scan all the items you want while you go over the list. It's easier, and it saves time.
Use App…Store Quickview for apps in the Mac App Store, and for apps, albums, podcasts, movies, books, TV shows, and iTunesU courses in iTunes.