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PDF is an electronic document format designed by Adobe Systems using some language features PostScript. The official program for viewing documents in this format, Adobe Reader. Most often, PDF-file is a combination of text with raster and vector graphics and text forms, scripts written in JavaScript and other types of items.

This format was created by Nokia for use in its proprietary phones. A bitmap image was used to transfer image files between devices over a wireless connection. It was mainly used when exchanging multimedia text messages that support inserting pictures.