An exported STL file from Pro-E or Solidworks contains a raw, unstructured triangulated surface defined by the unit normal and vertices of triangles, organized according to the right-hand rule in a three-dimensional Cartesian coordinate system. The file essentially represents a collection of triangular facets, each with specific coordinates. Users can utilize this information for various applications, such as developing programs that recognize the faces of basic shapes. The discussion highlights the technical aspects of STL files and their potential uses in software development. Understanding the content of STL files is crucial for effective 3D modeling and manipulation.