The VSDX file format is the primary file format used by Microsoft Visio for storing vector graphics, diagrams, flowcharts, and other visual representations of data and processes. It is based on the Open Packaging Conventions (OPC) standard, which means it's essentially a ZIP archive containing XML files and other resources that define the drawing's structure, content, and appearance. This format replaced the older .VSD format with the release of Visio 2013, offering improved interoperability, smaller file sizes, and enhanced security features. VSDX files can contain shapes, text, images, connectors, and various other elements arranged on one or more pages. They support a wide range of diagram types, including flowcharts, organizational charts, network diagrams, floor plans, and engineering schematics. The XML-based structure allows for easier programmatic manipulation and integration with other applications. The format is designed to be more resilient to corruption and offers better support for complex diagrams with large numbers of shapes and connections. It is the standard format for sharing and collaborating on Visio diagrams.