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With the exception of AutoCAD 2016, which only runs on Windows 10, AutoCAD is available on Microsoft Windows-based computers, macOS, and Linux. In addition, AutoCAD is available for iOS, Android and Windows Phone operating systems.
AutoCAD is installed with the application and works with AutoCAD LT and AutoCAD WS, which are preinstalled with a number of computer systems. In addition, the free AutoCAD for Mac download is compatible with Autodesk software products such as AutoCAD LT for Mac and AutoCAD WS for Mac.
AutoCAD's main use is in the design and drafting of 2-D and 3-D models such as houses, buildings, vehicles and other objects. It can also be used for documenting complex workflows and implementing BIM (Building Information Modeling) systems. It can also be used to generate construction plans.
What Kinds of Models Can I Make?
The types of models you can create with AutoCAD are known as objects. Each object is defined by an object model. In addition, you can link object models to create new object types called groups.
The models in AutoCAD can be extremely complex, and the number of objects can reach into the millions.
Many models require the use of parts. A part is the individual element that makes up a complete object. These parts can be connected to make large, highly complex models. In addition to parts, you can assign styles, which are unique attributes for objects in a drawing.
How Do I Use AutoCAD?
The main way to use AutoCAD is via the application interface, which is available through either AutoCAD LT (for Windows users) or AutoCAD WS (for Windows users who need to access a CAD server). You can also connect to a server through the command line.
AutoCAD LT and AutoCAD WS share a common interface; in other words, you can interact with both of them using the same commands.
Note: Make sure to check if you need to install the command line for AutoCAD LT or AutoCAD WS.
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AutoCAD LT
AutoCAD WS
A brief introduction to the main features of AutoCAD is provided below. If you have never used AutoCAD, you can read the following tips in order to get started with the software.
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COM objects 
AutoCAD uses COM objects. COM is a standard way of writing software plug-ins for desktop applications. Microsoft COM was introduced in 1986 and later standardized by the OLE team. The AutoCAD COM objects were available before AutoCAD 2000, and they have been enhanced since then, although the.NET APIs are superior in many ways.
Some benefits of COM include:
 plug-ins and code written for one version of AutoCAD can be moved to another version (without having to recompile)
 security (programs with a greater number of security permissions are more secure than programs with fewer permissions). In addition, security permissions for a given object can be set in individual zones or as a global level.
 cross platform use (AutoCAD has been ported to a number of operating systems), including: Windows, macOS, Linux, DOS, IBM OS/2 and OS/400
The COM objects are called "AutoCAD objects". These objects can be accessed through a COM interface, written in AutoLISP, Visual LISP or Visual Basic.
Because AutoCAD uses the Windows API, the ObjectARX COM interface was introduced to allow AutoCAD to interact with the COM objects.
COM automation 
The.NET Framework provided two improvements for AutoCAD automation.
The first is to allow the program to be modular and have plug-ins or add-ons written for different aspects of the program. The second is to allow the program to interact with the objects in a non-COM environment, which is required for accessing certain features in Windows Vista.
By using the ObjectARX libraries, AutoCAD can easily write COM objects to interact with other programs.
Natively, AutoCAD has the ability to retrieve information from other AutoCAD and non-AutoCAD applications. In particular, it can retrieve the current drawing from a window under its command line, convert information into the clipboard, and read information from the clipboard.
The following is a list of the most common AutoCAD API COM objects
CLSID definition 
A CLSID (Class ID) is a unique identifier for a particular COM object. For example, to find the CLSID of an object, it can be seen in the properties dialog for the object or when importing a new object. CLSIDs are mostly used in the registration process.
Once a new COM object is created, it must be registered with the registry
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