A PPSX file is a Microsoft PowerPoint Open XML Slide Show file. It is a presentation file format created by Microsoft PowerPoint 2007 and later versions. Unlike the standard PPTX presentation file, a PPSX file opens directly into "Slide Show" mode, meaning it starts playing the presentation from the first slide immediately, without displaying the editing interface. This makes PPSX files ideal for distributing final presentations that are meant to be viewed rather than edited, such as for kiosks, self-running demonstrations, or presentations shared with an audience where editing is not desired. The 'X' in PPSX signifies that it is based on the Open XML standard, which is a zipped, XML-based file format. This structure allows for better file recovery, smaller file sizes, and improved interoperability compared to older binary formats like PPS. It can contain slides, text, images, audio, video, charts, and other multimedia elements, along with transitions and animations.