The VSD - Visio Drawing File is the saved output of a Visio drawing project. Visio is a drawing and diagramming software tool. It can be used for multiple design purposes including business process design, spatial design, home design, data connection relationship design, organizational charts, data models and flow charts. Shapes can be imported into Visio for special purpose use.
The diagrams created with Visio are saved in files with a vsd extension. These diagrams can communicate complex information visually and can be viewed with Microsoft Visio Viewer (vviewer.exe) , so Visio is not required for viewing Visio Drawing Files.