AutoCAD is a software applicaton for computer aided design and drafting. The software supports both 2D and 3D formats. The software is developed and sold by AutoDesk inc., first released in December 1982 by Autodesk in the year following the purchase of the first form of the software by Autodesk founder, John Walker. AutoCAD is Autodesk's flagship product and by March 1986 had become the most ubiquitous microcomputer design program in the world, utilizing functions such as "polylines" and "curve fitting" Prior to the introduction of AutoCAD, most other CAD programs ran on mainframe computers or microcomputers with each CAD operator (user) working at a graphical terminal or workstation.
Autodesk Inventor, developed by U.S.-based software company Autodesk, is 3D mechanical solid modeling design software for creating 3D digital prototypes used in the design, visualization and simulation of products. Inventor includes an integrated motion simulation and assembly stress analysis environment. Users can input driving loads, friction characteristics, and dynamic components, then run dynamic simulation tests to see how a product will work under real-world conditions. The simulation tools can help users optimize strength and weight, identify high-stress areas, identify and reduce unwanted vibrations, and size motors and actuators to reduce energy consumption.