Microsoft Visio is a diagramming and vector graphics application used to create diagrams, flowcharts, organizational charts, floor plans, and more. It provides a wide range of templates and shapes that users can customize to visualize complex information and processes effectively. Visio integrates seamlessly with other Microsoft Office applications and offers collaboration features through SharePoint and Microsoft Teams. It is widely used by professionals across various industries for visualizing data, enhancing communication, and streamlining workflows.