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The AutoCAD brand is also used for its sister product, AutoCAD LT, which was first released in 1999. Its low-cost subscription model was intended to serve smaller businesses and other organizations that did not require the full feature set of AutoCAD.
The aim of AutoCAD (and its sister product, AutoCAD LT) was to automate the process of creating the digital representation of a physical object, the AutoCAD User's Guide explains. The key concepts of AutoCAD are:
Drafting: Create 2D and 3D drawing objects
Design: Draw and modify 2D and 3D drawing objects
Parameter Control: Change settings within drawing objects
External Link: Connect drawings with external files, such as MS Office documents or spreadsheets
While the user interface (UI) of the application is simple, the program allows users to quickly create complex drawings and free up their time.
Most CAD programs are either very basic, requiring the user to navigate through lists of menus, or too complex and difficult to use.
In 2017, 2.9 million AutoCAD users were reported by the software's developer, Autodesk, for 2015.
In 2016, among Canadian and European IT hardware and software specialists and consultants, the most influential technology in 2017 was CAD software, according to the poll.
Autodesk AutoCAD users
Why use Autodesk AutoCAD? One of the main advantages of Autodesk AutoCAD is that its source code is made freely available, which allows anyone to use and modify the program. The application's user interface (UI) is also fairly simple.
AutoCAD is available in several versions to suit different budgets and requirements. Basic AutoCAD is a 32-bit version of the application, while most professional applications are 64-bit.
The version of AutoCAD you buy will likely be locked to one platform, but AutoCAD LT has been released in both 32- and 64-bit versions and is available for all platforms.
While AutoCAD is generally free to download and use for personal use, users can purchase upgrades and add-on packages. The AutoCAD software suite can cost anywhere from $170 to over $2,000 for a single license. In addition, there are several AutoCAD subscription plans. The 2D AutoCAD subscription costs $1000 per year, while
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Programming Language: AutoCAD supports many different programming languages; including AutoLISP, Visual LISP, VBA, and.NET.
AutoLISP
AutoCAD provides an AutoLISP API that was added to AutoCAD in 1998 with AutoCAD 2000.  AutoLISP is an interpreted object-oriented programming language. It is available for download free of charge and in its standard form is compatible with the AutoCAD 2004 program. It was originally derived from the AutoCAD development environment of the same name. It is now maintained by the Autodesk Technical Support group.
Using AutoLISP one can program AutoCAD to perform certain tasks or functions such as drawing an architectural plan, ordering material, or automating a task. AutoLISP allows basic calculations and automation of certain basic functions and is good at calculating a distance, creating a perimeter, or moving the edge. More advanced tasks can be programmed with AutoLISP but it takes more knowledge of AutoCAD programming and mathematical functions. The AutoLISP programming language is compiled into a set of high-level operations using the underlying Autodesk Graphics Processing Unit (GPU) and programmed using the API of AutoCAD.
Visual LISP
Visual LISP is a visual programming language that can be used to control the functionality of AutoCAD. Visual LISP was an evolution from the earlier named Visual InterDev, which was Visual Basic for AutoCAD. It is available for both free and paid versions of AutoCAD. Visual LISP is not compatible with AutoLISP, AutoLISP is interpreted and Visual LISP is compiled. Visual LISP is mainly used for its interactive features.
Visual LISP is shipped with most recent versions of AutoCAD, with the ability to modify the installation by loading custom modules. It is also a supported third-party add-on. Visual LISP's main users are 3D software engineers and other CAD users.
VBA
VBA, is the Microsoft Visual Basic for Applications (Microsoft, 1997). VBA was created to provide a simpler way to develop for AutoCAD, to create macros. VBA is interpreted and its compiled programs run on the underlying AutoCAD Application Programming Interface (API) which creates VBA applications or macros in AutoCAD.
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