Microsoft Word 2010, and its predecessor, Microsoft Word 2007 brought a radical new appearance to the Microsoft Word product. Along with all other Microsoft Office 2007 applications, Word was overhauled, with the classic toolbar replaced with a ribbon approach which grouped certain items together. Although this required users to 'relearn' Microsoft Word, it has generally been well received. Word 2010 allows users to add images and diagrams to documents with far less clicks than earlier versions and provides the Styles, Formatting and Themes needed to produce professional looking files.
Microsoft Word 2010 uses DOCX as its default file format type. This file format is based on XML and provides business structure and meaning to documents allowing them to be interrogated by other applications more easily. The DOCX format is also more efficient at compression, providing the user with a smaller file size compared to the equivalent document created with a .DOC file extension.
PDF is a file format developed by Adobe Systems for representing documents in a manner that is separate from the original operating system, application or hardware from where it was originally created. A PDF file can be any length, contain any number of fonts and images and is designed to enable the creation and transfer of printer-ready output.
Each PDF file encapsulates a complete description of a 2D document (and, with the advent of Acrobat 3D, embedded 3D documents) that includes the text, fonts, images and 2D vector graphics that compose the document. They do not encode information that is specific to the application software, hardware, or operating system used to create or view the document.