If you enjoy photography, iPhoto for iOS could be the best $4.99 you've ever spent on an iPhone or iPad app.
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Under Photos, you can see all your photo and video files in one place. The Events view shows groups of photos that have been imported into iOS's built-in Photos app. iPhoto recognizes these collections of photos and lets you work with them as groups. Finally, Journals displays all the photo collections you've published to the Web via iCloud. (More about this later.)