STL, an abbreviation for stereolithography, is an interchangeable file format that represents 3-dimensional surface geometry. The file format finds its usage in several fields such as rapid prototyping, 3D printing, and computer-aided manufacturing. It represents a surface as a series of small triangles, known as facets, where each facet is described by a perpendicular direction and three points representing the vertices of the triangle.
A file with .wmz extension is an intermediate level file generated by older versions of Microsoft Office applications. It can contain embedded equations, clip art, or other vector graphics.
You can also convert STL into many other file formats. Please see the complete list below.