STL which has several backronyms like “Standard Triangle Language” and “Standard Tessellation Language” is a native file format to the stereolithography CAD software. The STL files describe only the surface geometry of a three-dimensional object without color, texture, or other attributes. In order to view the STL file, you need to use either of the following applications (i.e. Microsoft 3D Viewer, Microsoft Print 3D, IMSI TurboCAD Pro, GOM Inspect, etc).