STL (Stereolithography) is a file format native to the stereolithography CAD software created by 3D Systems. STL files describe only the surface geometry of a three-dimensional object without any representation of color, texture or other common CAD model attributes. It represents the surface as a collection of triangles, also known as a mesh. Each triangle is defined by the coordinates of its three vertices and a normal vector indicating the triangle's orientation. Because STL files only describe the surface geometry, they are widely used for rapid prototyping, 3D printing, and computer-aided manufacturing (CAM). The simplicity of the format makes it easy to process and manipulate, allowing for efficient slicing and toolpath generation. STL files are commonly used to transfer 3D models between different software packages and manufacturing equipment. The format is widely supported by 3D modeling software, slicing software, and 3D printers, making it a standard for representing 3D models for additive manufacturing processes. While STL is widely used, it has limitations, such as the lack of support for color, texture, and material properties. This has led to the development of alternative formats that offer more comprehensive model representation.