computer software that allows users various computer systems (PC, Macintosh, minicomputer, mainframe) to transfer a document from one computer system to a different (via disk or Internet), without any degradation or improvement in how the document seems regarding display screen or in printing. Acrobat preserves colors, fonts, graphic elements, and layout of a document and reproduces all of them precisely. It converts the document's file format into portable document file (PDF) format which can be read by any computer system by making use of Acrobat Reader computer software (without needing the program program with which the document ended up being initially produced). PDF may be the de facto global standard for platform-independent distribution of publications, brochures, catalogs, ezines, updates, also forms of literary works. See in addition Extensible Markup Language (XML).