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What is Advanced Photo System?

The Basics:

Advanced Photo System (APS) is an alternative, and now defunct, film format developed by Kodak in 1996. The film was 24mm wide, came in three different aspect ratios and, unlike standard 35mm or 120 film, could be removed from the camera partially exposed to be used later.
The Advanced Photo System type-C (or APS-C) is the equivalent digital image sensor format for digital photography which Canon, and other manufacturers, have adopted for entry to mid range DSLRs.