Adobe Reader is a freeware program for viewing, commenting and printing PDF (Portable Document Format) files. The PDF format is a cross-platform universal document format that is supported by all existing modern systems. It was originally created by Adobe Systems for the transfer of printed products. Currently, this format has become a generally accepted standard for the transfer of documents, this format produces various manuals and references, e-books, magazines, booklets and much more. The main advantage of the PDF format is that on any device the content and structure of the document will be displayed in the same way as on the device on which it was created. Therefore, any user just needs a program to read this format.