Since 2007, Microsoft began to use a file format docx, which is created by using the Office Open XML. The format is a zip-file containing the text in the form of XML, graphics and other data that can be translated into a sequence of bits using patent-protected binary formats. At first it was assumed that this format will replace the doc, but both formats are still used today.
DOC is a file extension for word processing documents. It is associated mainly with Microsoft Word application. DOC files can also contain charts and tables, videos, images, sounds and diagrams. It supports almost all the Operating Systems.