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PDF is an acronym for "Portable Document Format".
PDF is a file format created by Adobe that lets you view and print a file
exactly as the author designed it,
without needing to have the same application or fonts used to create the file.
Since its introduction in 1993,
PDF has become an Internet standard for electronic distribution
that faithfully preserves the look and feel of the original document
complete with fonts, colours, images, and layout.
Adobe® Acrobat® Reader is free, and freely distributable, software
that lets you view and print Adobe Portable Document Format (PDF) files
on all major computer platforms, as well as fill in and submit PDF forms online.