The SKP file extension is used for 3D models created with SketchUp, a popular 3D modeling software developed by Trimble Inc. These files contain all the information necessary to represent a 3D model, including geometry (vertices, edges, and faces), textures, materials, lighting, and component definitions. SKP files can range from simple models of single objects to complex architectural designs and landscapes. They are commonly used by architects, interior designers, engineers, and hobbyists for creating and visualizing 3D designs. SketchUp allows users to create models from scratch or import existing 3D data from other formats. The software also provides a vast library of pre-built components and models that can be easily integrated into projects. SKP files are often used for presentations, design reviews, and construction documentation. They can be exported to other 3D formats for use in other applications or for rendering and animation. The SKP format has evolved over different versions of SketchUp, so compatibility between different versions may be a concern. Newer versions of SketchUp can generally open older SKP files, but older versions may not be able to open newer files without conversion.