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CAD stands for "Computer-Aided Design." AutoCAD is a line of two-dimensional and three-dimensional design software produced by the Autodesk company. It includes a powerful suite of features to improve workflow and create true-to-life maps, diagrams, structures, and schematics. CAD software is equal part design and analysis. The design is needed to produce models and prepare component production, and the analysis helps calculate stress levels, the influence of forces, and the influences of finite elements in a design. Free AutoCAD programs are available for students and educators through their school or by obtaining a free trial membership with companies like Autodesk.
(https://www.autodesk.com/education/edu-software/overview?sorting=featured&filters=individual) Yes, CAD is a subject in mechanical engineering.
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