AutoCAD is one of the original PC-based design applications, used for creating plans that can be fed into computer-controlled machining rigs. It's primarily focused on the creation of two-dimensional design blueprints, though later versions have added some 3-D support. The feature set of CAD has grown in line with commercially available computing power. It could initially only use simple lines, arcs and polygons, but as the power of home PCs has increased to be able to handle more, the feature-set of AutoCAD has expanded to match it.
SolidWorks is a three-dimensinal (3-D) modeling tool, created by D'Assault Systemes. It is used for creating accurate 3-D representations of objects. It is what is known as a parametric modeler, referring to the dimensions of created objects as parameters. Relationships between the various parameters of an object can be created, which will automatically update when one of them is altered. This simulates the effect that changing that value, would have on the object as a whole.
Solidworks is a "parametric" solid modeller used for 3D design.autocad is primarily a 2D design tool that does have some 3D capability, but is very simple compared to any parametric solid modeller (although 3D is improved in AutoCAD 2007). Autodesk(who makes AutoCAD) makes a product that is nearly identical to solidworks, called Inventor, which is a parametric program for design of solid parts and assemblies.
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