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Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.
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Portrait orientation is still used occasionally within some arcade and home titles (either giving the option of using black bars or rotating the display), primarily in the vertical shoot 'em up genre due to considerations of aesthetics, tradition and gameplay. Games made primarily for mobile devices are often designed around portrait mode play.