is an e-book format created for Amazon’s Kindle8. This format supports the CSS3 pop-up text system and HTML5 as well as built-in fonts; moreover, it possesses powerful document-formatting capabilities. It contains a function of independently activated DRM protection. AZW3 books can be created with KindleGen, a free software program from Amazon.
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.