STL files are commonly used for 3D modeling and design. To view an STL file, you can use various software and online tools. If you have 3D modeling software like AutoCAD, SolidWorks, or Blender, you can simply open the STL file within the software to view and edit it. Additionally, there are dedicated STL viewers available for free download, such as FreeCAD, MeshLab, and 3D-Tool. These viewers allow you to visualize STL files without the need for advanced 3D modeling knowledge. Some online platforms also offer STL file viewers that enable you to upload the file and view it directly in your web browser. Whether you are a professional CAD designer or a hobbyist looking to explore 3D modeling, there are various options available to easily view and interact with STL files.