PDF (Portable Document Format) is a popular file format which is created by adobe system in 1993 for document exchange. PDF is used for representing two-dimensional documents in a manner independent of the application software, hardware, and operating system. Each PDF file encapsulates a complete description of a fixed-layout 2D document (and, with Acrobat 3D, embedded 3D documents using U3D) that includes the text, fonts, images, and 2D vector graphics which compose the documents.
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