Visio is a diagramming tool developed by Microsoft that allows users to create a variety of visual representations, such as flowcharts, organizational charts, and network diagrams. It provides a user-friendly interface with drag-and-drop functionality, making it accessible for both beginners and experienced users. The software is often used in business and engineering settings to illustrate complex processes and systems clearly. Visio integrates well with other Microsoft Office applications, enabling users to import and export data easily, enhancing collaboration and communication within teams.