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What is AutoCAD?
AutoCAD is a CAD software application, which is used by engineers, architects, drafters, and many other professionals to design everything from buildings to bridges to pipes. AutoCAD offers functions that include design, engineering, drafting, and mathematics. There are two models of the software: AutoCAD LT and AutoCAD R. AutoCAD R is geared more towards advanced users and provides many more features. AutoCAD LT is more suitable for beginners.
With either model of AutoCAD you can create two-dimensional (2D) drawings, three-dimensional (3D) drawings, sketchup-like wireframes, animations, and interactive UIs. You can also link to other products within AutoCAD or to other files in AutoCAD. AutoCAD is available in both English and Spanish languages. You can purchase either a perpetual license or a subscription. You can use your old license in AutoCAD 2017 R2 and AutoCAD LT 2017.
AutoCAD also works on Windows and Mac. There is also a Linux version of AutoCAD that is distributed by a third party.
AutoCAD History
AutoCAD is the result of a merger between two companies. In March 1981, American professional design software developer Symbol Systems, Inc. (SSI) purchased Swiss-based Geometric International (G.I.). SSI's commitment to the European market led to the development of AutoCAD. In April 1983, SSI released AutoCAD Version 1.0.
Since the merger, AutoCAD has benefited from enhancements and enhancements. In September 1991, AutoCAD Version 2 was released, which was a completely new version of AutoCAD. In December 1992, AutoCAD Version 3 was released. In January 1996, AutoCAD Version 4 was released and is considered the start of the AutoCAD R (R stands for re-engineered) series.
The next big thing for AutoCAD came with AutoCAD 2002, released in March 2002. This version included the 3D environment (which was not part of AutoCAD at the time). AutoCAD 2002 was also the first version to offer support for both Windows and Mac platforms. By 2004, the AutoCAD R2 series was available, with AutoCAD R2.5 in April 2004. AutoCAD R3 was released in September 2005, with AutoCAD R3.5
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There are two main types of properties, properties of entities and attributes. Attributes are properties with special use. For example, element properties can be visual properties like the elevation and color of faces and surfaces, or properties used for placement and construction.
An example of a class diagram for a drawing:
History
According to some sources, Autodesk first produced AutoCAD in 1985. It was designed to provide a CAD system specifically for engineers at the time. As a starting point, it was a large, slow, and expensive application. Later, the intention was to make it a set of tools that could be used by more than just engineers. Another goal was to create a product that would satisfy both their professional and home users. It was one of the first PC applications to use an easy-to-learn graphical user interface, and it offered a fully customizable workspace. It initially supported only drawing and did not do any plotting, but it eventually added plotting and 2D and 3D drawing capabilities. This version of AutoCAD was released under the name AutoCAD 1981. 
AutoCAD 2 was released in 1986, with the first major revamp since the earlier 1980s product. It added the ability to create and plot plots.
By 1989, AutoCAD 3 was released, featuring an interactive floor plan, enhanced attribute system, and improved graphics. The product was sold in a bundle with the Autodesk Authoring Studio. Another major change was the introduction of multi-user capabilities. Up to that time, AutoCAD could only be used by a single user. However, by the late 1980s, multi-user sharing of data had become standard and AutoCAD 3 featured this capability.
The next version, AutoCAD 4, came out in 1994. It had a greatly expanded attribute system, and 3D modeling tools. It included a more intuitive programming interface (AutoLISP) and improved 3D modeling tools. AutoCAD 4 also introduced the concept of the "AutoCAD Library", a central repository of commonly used objects. 
AutoCAD R14 came out in 1996. It was the first version to be fully 32-bit and also introduced new user-interface features such as the ability to flip walls and design the plans of the wall cavity as well as improved object-management tools.
In 1999, AutoCAD R15 was released. It introduced new predefined objects for greater modeling flexibility, improved modeling and working
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