Firefly is a visual-scanning app on Amazon Fire Phone that uses the smartphone’s camera to find items and objects.
Firefly has image, text and audio recognition technology to help you scan and identify books, songs, movies and other items. It can recognize movies and TV shows, songs, printed web and email addresses, phone numbers, QR and bar codes, artwork, and million products over Amazon. It works by pressing the dedicated button on the side of the Amazon’s Fire Phone.
(Image- via Amazon.com)
Basically it lets you to order products straight from your phone just by scanning or hearing them. You can purchase the real-world entities by scanning items with your Fire phone.