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The history of CAD goes back to the beginnings of mechanical engineering, however CAD use really only took off in the 1980s. What CAD is, is a graphical computer program for creating drawings and drafting components. CAD drawings are 2D representations that can be scaled to any size, and is usually based on a blueprint, but it can also be based on 3D drawings. The dimensions of the CAD drawings are generally geometrically accurate. CAD drawings can also be converted to more than one other file type, including DWG, DXF, DGN, DWF, FBX, IGES, DWF (and more). Autodesk AutoCAD is a very powerful application, and anyone can use it to produce drawings.
AutoCAD was originally developed by Steve Whitney and Albert (Bert) Claar who formed Whitney-Claar Design Systems in 1979. Initially, the CAD system was simply called CAD. The letters were added to distinguish it from other types of CAD programs. Whitney and Claar envisioned CAD as a commercial CAD program, and in 1981 they formed Whitney-Claar, Inc. in Bedford, Massachusetts. Autodesk bought Whitney-Claar, Inc. in 1982, renaming it AutoCAD. In 1983 Autodesk also acquired the second CAD company, Starchart Engineering, Inc. (now Fathom Creations, Inc.). Starchart focused on drafting software, and in 1982, Whitney and Claar had been working with Starchart.
Overview of AutoCAD
AutoCAD is a specialized CAD program, and is focused on creating 2D drawings and drafting components (i.e., design documentation), not 3D products such as a structural steel or architecture design. Although AutoCAD can be used for some 3D tasks (although not as effectively as a 3D modeling program such as, for example, Autodesk AutoCAD LT), the primary function of the CAD application is to create 2D drawings and design documentation.
A drawing can be based on a 2D drawing or blueprint, or 3D information (i.e., a 3D drawing or 3D model). Drawings are usually made up of either layers (for 2D drawings) or solids (for 3D drawings). In AutoCAD, solids and groups of solids are called components.
Every drawing contains text. The text is usually in a standard font such as Times, Calibri, or Arial, and
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CAD model format
3D modeling 
AutoCAD also has the ability to import, export, and use 3D object models.
AutoCAD uses its own 3D modeling engine, but other systems may also be able to import the 3D objects. The AutoCAD system contains various tools for manipulating 3D objects, such as 3D UCS, scaling and moving the 3D objects, generating and modifying surfaces, placing and deleting surfaces, and surface modification tools such as filling and trimming the model.
The full capability of the 3D Modeling Engine requires AutoCAD and is referred to as Classic 3D, which is not available to all AutoCAD users.
Cloning 
AutoCAD allows users to clone objects to generate a new object in the same location and orientation as the original object, but which can be scaled, moved, deleted or copied.
Freehand drawing 
AutoCAD users have the ability to draw using either a mouse or a stylus.
Graphical user interface
Raster graphics 
While most CAD systems use vector graphics, AutoCAD still allows drawing in raster graphics.
CAD files 
AutoCAD files are file types of which there are several standards. These CAD files have the ability to represent geometrical information of objects and are often used for the design of machinery, furniture and architecture.
FTP/SFTP 
AutoCAD files can be exchanged with other computer systems using the File Transfer Protocol (FTP).
Mobile 
AutoCAD files can be exchanged with other computer systems using the Secure File Transfer Protocol (SFTP).
Autodesk Exchange Apps 
Autodesk Exchange Apps are downloadable add-ons that can be used in AutoCAD. These add-ons can create a variety of features such as 3D models, documentation and bills of materials. They are also a great resource for quick and easy CAD development. They are available from Autodesk Exchange Apps on the Autodesk Exchange store.
Software libraries
Autodesk Architecture Libraries 
The Architecture Libraries are collections of extensions to AutoCAD. They are written in.NET, C# and Visual Basic. They are designed to make it easier to create an application based on AutoCAD Architecture that resembles a typical spreadsheet application. They are available through Autodesk Exchange Apps on the Autodesk Exchange
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