Parameters refer to restrictions which values determine the shape or geometry of the model. SolidWorks is a parasolid-based solid modeller, and utilizes a parametric feature-based approach to create models and assemblies. Various third-party tools can be used to extract these sub-files, although the sub-files in many cases use proprietary binary file formats. This means that there is various files embedded within each SLDDRW (drawing files), SLDPRT (part files), SLDASM (assembly files), with preview bitmaps and metadata sub-files. SolidWorks files use the Microsoft Structured storage file format. SolidWorks is a 3D mechanical CAD (computer-aided design) program that runs on Microsoft Windows. Autodesk (the manufacturer of AutoCAD) makes a product that is nearly identical to SolidWorks, called Inventor, which is a parametric program for design of solid parts and assemblies.
It is very simple compared to any parametric solid modeller (although 3D is improved in AutoCAD 2007). AutoCAD, however, is primarily a 2-D design tool with some, but limited 3-D capabilities. Parametric means that the dimensions can have relationships between one another and can be changed at any point during the design process to automatically alter the solid part and any related documentation (blueprint).
SolidWorks is what we call a "parametric" solid modeller used for 3-D design.
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