The PPTX file format is the primary file extension used for presentations created with Microsoft PowerPoint, starting with PowerPoint 2007. It's based on the Office Open XML (OOXML) standard, which is a zipped, XML-based file format. This means a PPTX file is essentially a compressed archive containing XML files that describe the presentation's content, layout, and formatting, along with any embedded media like images, audio, and video. PPTX files are used to create and deliver slideshow presentations containing text, images, charts, animations, and multimedia elements. They are widely used in business, education, and personal settings for presenting information in a visually engaging and structured manner. The open standard nature of PPTX allows for greater interoperability compared to older, proprietary PowerPoint formats, making it easier to share and open presentations across different platforms and software applications. PPTX files support a wide range of features, including slide transitions, animations, speaker notes, and embedded fonts, allowing for the creation of sophisticated and interactive presentations.