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Launched by a team of Purdue University researchers in 1976, AutoCAD was designed as a smaller alternative to CA's then-leading product, the 3D-modeling CAD software program Autostudio. The original AutoCAD application was released as a command-line application, running as an early version of AutoRun. AutoCAD was designed to run on Apple II microcomputers and, later, on the new IBM PC compatible computers. In 1982, the first AutoCAD release was made available for the Apple II personal computer and Microsoft's first DOS-based computer, the IBM PC.
The application's user interface and interface model is primarily mouse driven. In this manner, the interface is similar to the user interface used in Microsoft Windows 3.0 and later versions. The menu items and toolbars are organized into "drives," with the main menu and toolbars residing on a single "start" drive. Users can select tools and menu items by choosing them from the top-level "start" drive menu. Drives other than the "start" drive are known as "auxiliary" drives. Auxiliary drives can be expanded by the user through further menu selections. Drives can be expanded and collapsed to allow the menu and toolbar navigation to be optimized for the users' task.
A primary menu of buttons, tabs and dialog boxes can be accessed from any drive and multiple dialog boxes can be opened at once. Toolbars can be added to any drive and can be combined and/or un-combined with other toolbars. An application can use any number of toolbars. In the original release of AutoCAD, there were three toolbars, the Home toolbar, the Scenic toolbar, and the Dimensions toolbar. A feature allowing users to change the appearance of the toolbars was added in the AutoCAD release. Another toolbar was added in the AutoCAD 97 release, which allowed users to select the features of a CAD object, such as the coordinates of the object's center.
The schematic drawing, Drafting & Annotation, and Dimensioning features of the AutoCAD software provide basic drafting and drawing capabilities. These features are useful for drafting two-dimensional objects, particularly for architectural projects.
In AutoCAD, 2D and 3D drawings and schematics are represented by blocks, or entities, that are interconnected to show the relationship of the blocks and the entities that connect them. While
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2D/3D 
AutoCAD (and AutoCAD LT) is used for 2D design, surveying, and mapping. AutoCAD is not limited to 2D only, and can be used as a 3D modeling tool with the inclusion of many tools. For 3D modeling, it was originally only usable with version 15 for a short period of time. AutoCAD Architecture uses a 3D interface to model 2D drawings, the most notable being Architool-AutoCAD.
Desktop and mobile apps are available, as well as 3D on the Web and a 3D version of AutoCAD called AutoCAD 360.
3D feature support
AutoCAD has 2D drafting and 3D modeling tools, and as such supports drafting and modeling of 2D and 3D drawings.
Design, modeling, and drawing
A command named 'Draw' was introduced in AutoCAD 2000 to allow drafting and editing of 2D drawings.  The 'Draw' command and other commands used to create 2D drawings now generally perform the same task as the '3D Model' command. With AutoCAD 2012, the 'Draw' command no longer allows the user to create 2D drawings. Users must now select the 2D Design option from the 2D/3D Modeling tab to create 2D drawings.
The 'Draw' command is now generally used for creating and editing 2D drawings. As such, the 'Draw' command is available in all AutoCAD release except 16. The '3D Model' command is now generally used to create 3D models.
The AutoCAD 2000 'Draw' command only allowed for the editing of 2D drawings. With AutoCAD 2017, the 'Draw' command supports the creation of 2D drawings and is available in all releases. The '3D Model' command is now available only in AutoCAD 2010 or higher, and is only used to create 3D models.
Workflows and tools
AutoCAD workflows
By default, a user can only design a 2D drawing. A typical workflow might be to design a 2D drawing, place a bill of material, create a database, run an assembly, and then a series of 2D drawing revisions to refine the design. AutoCAD has three workflows:
Drafting (formerly 3D Modeling)
Drafting in AutoCAD is a similar process to
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