pdf The .pdf file format extension was developed by Adobe systems in 1993 as a means of presenting documents in a consistent manner across different platforms, hardware, operating systems, and applications. The format was not released as an open source document format until 2008, though minimal proprietary technologies still controlled by Adobe Systems exist in the format. Every .pdf document carries with it the necessary meta information required to properly reconstruct the text, fonts, and graphics used to produce the document. This ensures that documents will be viewed in exactly the same way the author intended regardless of the device used to open the document. From conception to date, Adobe Systems has continued to support the format adding features with every iteration of the standard including hardened algorithms for document encryption and privacy. Today, many freely available readers exist allowing you to open and view .pdf documents and create or convert other file formats such as .jpeg and .doc into .pdf documents.
odg ODG is a file extension for the OpenDocument (ODF) file format which is an XML-based file format. The OpenDocument file format is used in the creation of charts, spreadsheets, presentations and in word processing applications. XML is simply known as Extensible Markup Language which means, marking up data and encoding it into a file which is readable by both humans and machines.
The ODG file extension is used in graphics and stores vector graphics in standardized XML. It was first developed by the OASIS (Organization For The Advancement Of Structured Information Standards) and is meant to be used in other OpenOffice documents for storing texts, charts, spreadsheets and various graphical elements. When it was first created, the extension was used as a specification in the Apache OpenOffice suite, being one of the first office suites to offer and support the use of ODG files.