Doc (an abbreviation for ‘document’) is a file extension for a document created by Microsoft Word, the most popular word processing program. The .doc format is used for MS Word versions of between 97 and 2003. The later version of 2007 uses a different format.
MS Word was first created in 1983 for Xenix systems under the name Multi-Tool Word. Later newer versions were written for several other platforms like DOS running IBM PCs in 1983, the Apple Macintosh in 1984, and SCO Unix, OS/2, and Microsoft Windows in 1989. The M Word programs have the ability to create and share documents using a set of writing tools. These documents may include formatted text, images, tables, graphs, charts, page formatting, and print settings.
Invented by Adobe Systems and perfected over 17 years, Portable Document Format (PDF) is the global standard for capturing and reviewing rich information from almost any application on any computer system and sharing it with virtually anyone, anywhere. With the launch of Adobe® Acrobat® X software, PDF is more secure and dynamic than ever. That’s why individuals, businesses, and government agencies around the world trust and rely on PDF files to communicate their ideas and vision.