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The Autodesk AutoCAD software is a 3D CAD software for creating 2D and 3D drawings and presentations. It's most often used for the design, visualization and documentation of blueprints, aircraft, ships, cars and industrial equipment.
AutoCAD provides several ways to design your drawings. You can:
Create a simple shape by using the lasso tool (loose rectangle) and draw a line from one point to another (line).
Draw blocks of a template shape to form your own shape.
Draw a complex shape with freehand drawing tools.
Draw over an existing shape.
Create and customize objects in any category and layer, and then insert them into your drawing.
Convert data from external sources to a format that AutoCAD can use.
Key features of AutoCAD include:
3D DWG, DGN and DXF import and export to other CAD systems and file formats
Planes, profiles and 3D visibility and culling options
Data object importing and exporting
Brush, pen, eraser and other drawing tools
Categorization, annotation, and extensibility
Raster image display
Multiple coordinate systems
Measurement units
Variable and fixed formatting
Constant references
Themes
Color coding
Versioning
Document history
AutoCAD Design Features
You can begin by drawing a line from one point to another point to connect them in AutoCAD. The two connected lines become your guide and can be made thicker and thicker to create a thicker line, or thinner and thinner to create a thinner line.
Step 1: Drawing the first line
Click the Line tool, and click the start point and drag to the end point.
Step 2: Drawing the second line
Click the Line tool again, and click the start point again and drag to the end point again.
You can do this with other types of lines, such as Polyline, Centerline, AngleLine, Rectangle, and Circle, and with the Eraser tool. These are just some of the line-drawing tools available in AutoCAD.
You can draw a curve or complex line with the Line tool.
You can draw a freehand line with the Line tool.
You can draw a
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Application Program Interface (API)
 The Application Programming Interface (API) or Application Programmer's Interface is the language and calling convention for interchanging information and data between the computer application software, as well as the operating system. It is the language that allows programmers to develop software applications. AutoCAD is compatible with the following programming languages: C/C++, LISP, Visual Basic, Microsoft Visual C#.NET, Delphi, AutoLISP, Visual LISP, Java, C#, Objective-C, and C++ Builder.
Properties 
AutoCAD has properties that define the appearance of objects in the drawing, including type and dimensions. Properties are specified in the drawing or in a.BMP image file of the property set to edit a model. Each property set may have thousands of individual properties. Each property can have a value of 1, 0, or blank. For example, a property's value can be dimension units (like feet or inches). Other properties may include a Boolean, numeric, or character value (such as empty, no-thru, or most recent).
Shapes and groups 
AutoCAD supports the modeling of objects using the concept of shapes. Shapes are used to define geometry or construct two-dimensional and three-dimensional objects in the drawing. In AutoCAD, shapes are used to define objects. Shapes have four main attributes: points, lines, polygons, and surfaces. These shapes are either created using the drawing tools, or imported from a 3D model.
AutoCAD also supports a concept of groups. Groups are used to establish common or named collections of items. For example, a floor plan may be organized into a room, and then into individual rooms. The AutoCAD group system allows the grouping of items to be organized into subgroups and sub-subgroups.
History
AutoCAD R12 
AutoCAD R12 first shipped as a stand-alone application in October 1996, starting at about $3000.
AutoCAD R13 
AutoCAD R13 (also called AutoCAD LT) was first shipped in late March 1998. It was a new version of AutoCAD and was designed to be the first cross-platform CAD software. It was available for Microsoft Windows, OS/2 Warp 4, and OS/2 Warp 5, as well as MS-DOS. The OS/2 version of AutoC
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