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The first release, AutoCAD 1.0, was officially on December 14, 1982.[4][5] The operating system was Unix, and the first release was written in assembler using an Intel 8088 processor. The AutoCAD 1.0 release used a'magic number' keyboard layout and did not handle the U.S. Dvorak keyboard layout well. The number keypad was split between the left and right of the keyboard. The AutoCAD Plus release, in 1986, made the U.S. Dvorak keyboard layout available as an option. Starting with AutoCAD 2.0, in 1988, the software's operating system was replaced by a commercial operating system, and the proprietary Micro Workbench API was replaced by the open-source Open Database Connectivity API, which was itself replaced in 2002 by the open-source Open Database Connectivity 2.0 API. In 1989, AutoCAD for Windows was introduced to the Windows market. AutoCAD for Linux was introduced in 1996 and AutoCAD for OS/2 in 1997.
The initial release of AutoCAD was for the Apple II. In 1983, the Apple II version was released as a tape-based program called LCAD. In 1984, with the introduction of the Apple Macintosh, Autodesk acquired Infographics, a graphics company founded in 1981 to develop LCAD for the Macintosh and other platforms. In 1985, LCAD for the Macintosh was introduced and, in 1986, a version for the Atari 8-bit family, the ST. In 1988, the Macintosh version was renamed AutoCAD. Beginning with AutoCAD 2000, the program is available for IBM PC, Mac, and Unix platforms.
AutoCAD is sold as an individual package, which includes the computer-aided design software (AutoCAD) as well as all of the necessary technical documentation and technical support. For a fee, technical support is also available from Autodesk on an as-needed basis. In 1994, Autodesk launched a "Creative Cloud" program that allowed users to pay per year for ongoing support. In 2016, Autodesk released the AutoCAD WS (Workstation) subscription plan, which provides users with online access to a dedicated set of tools, updates, and training at no additional cost.
AutoCAD uses 2D vector graphics for the design, modeling, and rendering of 2D objects. In addition, some 3D geometry is used, and some 2D text
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User interface customization
 Windows has two different GUI styles. The default style is called Office, which is basically a simplified, bare-bones version of the Windows GUI. The other GUI style is called Professional. Professional is a fully-featured UI.
Work paths
Work paths in AutoCAD are similar to a Gantt chart. They are paths along which a user can draw a line, polyline, arc or spline. In addition, a user can create a closed work path that serves as a selection set for drawing objects. For a polyline, a closed work path can be used to define the edges of the polyline. In addition, a closed work path can be created and saved for later use as a closed path which cannot be edited (with some exceptions, see Editing closed paths below).
Path segment
The path segment is a straight segment of the path, except for the segment's curve. In AutoCAD, segments are similar to paths but they are not editable. They are created, edited and saved separately. For example, a path segment can be used to create a closed path.
Parametric surface
A parametric surface is a surface where curves are the variables and the values of the curves are the parameters. In AutoCAD, it is used to define an envelope, a single closed curve, or a closed spline.
Surface-based 2D modeling
AutoCAD has powerful surface-based 2D modeling tools for modeling regular surfaces and objects. It is possible to create very complex 3D objects by extruding simple geometric shapes.  Examples include spheres, cylinders, cones, ellipsoids, pyramids, tubes, etc.  See Document-based 2D modeling for details.
Surfaces
Surfaces are the most important AutoCAD tools. They are extremely versatile and can be used to create 2D and 3D objects. In AutoCAD, surfaces are used to draw a variety of 2D shapes including:
 Polyline
 Arc
 Bezier curve
 Spline
Planes
In AutoCAD, planes are used to define the boundaries of 3D objects. A plane is a two-dimensional geometric shape that is used to cut or project a 3D object. In AutoCAD, surfaces are the building blocks of objects.  Surfaces are created by two methods:  
 By using the Surface command, the command that creates a surface is found in the Model
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