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There are three types of AutoCAD: AutoCAD LT, AutoCAD Standard, and AutoCAD Premium. AutoCAD LT offers basic drafting and editing functions. AutoCAD Standard is a complete CAD package, with additional features. AutoCAD Premium is an advanced version of AutoCAD Standard, but it has a $1799.00 (USD) fee. AutoCAD Enterprise adds additional Enterprise functionality and an annual subscription to Autodesk Technology Network (ATN), and is offered by Autodesk as a subscription service.
Can AutoCAD be used for beginners? AutoCAD can be used by anyone who can learn to use a computer. AutoCAD LT is the most accessible version. All users who purchase AutoCAD LT are granted a free Autodesk Technology Network (ATN) subscription, which allows access to AutoCAD forums, blog, and wikis, as well as training and support resources.
Is there AutoCAD support for beginners? Yes. AutoCAD LT is easy to learn. Each program is provided with a thorough AutoCAD LT User's Guide (Excerpt), which will guide you through the basics of AutoCAD LT. You can also purchase a Training Video Guide that guides you through all the features of the software. Both guides are available at 
How many layers can AutoCAD have? There are 16 layers in AutoCAD LT. The number of layers can be increased by purchasing Autodesk® Advanced Layers & Components (ALC). There is a one-time setup fee of $1099.00.
How do I create AutoCAD drawings? Once you've activated your AutoCAD LT license, you can work from the home screen or create drawings in the Drawing tab. You can create drawings by using the Line, Polyline, Arc, Extrude, Align, Polyline Join, Shading, Label, Solids, Text, View, Icon, and Center commands, the Undo function, and the drawing tools. A tour of AutoCAD features (PDF), and a guide for using the drawing tools (PDF), can be found at 
Can I use the same drawing that is open in other applications? Yes. In the Drawing tab,
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Software architecture 
The software architecture of AutoCAD 2013 is largely similar to that of earlier versions of AutoCAD, such as AutoCAD 2002, but contains a number of changes and additions, as well as a few major changes. It consists of:
 Developer tools, which includes:
integration of third-party applications, typically through the use of APIs and through plug-ins
features such as internal symbol libraries and a "quick symbol finder" feature in the drawing area that allows users to quickly view documentation or information on items and properties and make changes to those objects
Python scripting. AutoCAD's Python scripting support was originally introduced in AutoCAD 2000 and is available through Windows Script Host (WSH) and the AutoLISP. There are numerous free and commercial Python libraries for AutoCAD.
 Database schema 
As with other AutoCAD versions, the AutoCAD database schema contains metadata about objects, views, attributes, geometric and 3D properties, and custom objects defined by users and plugins.
Compatibility 
AutoCAD and AutoCAD LT can be run on multiple operating systems, including Windows 7, Windows Vista, Windows XP, Windows Server 2008 R2 and Windows Server 2008. The operating system requirements for AutoCAD 2013 are Windows 7, Windows Vista, Windows XP or Windows Server 2008. AutoCAD and AutoCAD LT have been tested successfully on the following operating systems:
 Windows XP 64-bit
 Windows 7 64-bit
 Windows Vista 64-bit
 Windows Server 2008 32-bit
 Windows Server 2008 R2 64-bit
 Windows Server 2012 64-bit
Windows 8 and Windows 8.1 were not tested as of April 2013.
There is also a Linux version of AutoCAD available.
There is also an unsupported version of AutoCAD available for Mac OS X Leopard through Tiger. This unofficial version of AutoCAD is provided by AutoCAD Revolution (formerly known as Kiosk Studio).
AutoCAD LT 
AutoCAD LT was the first release of AutoCAD for Windows and the predecessor to AutoCAD 2013. It was available for download free of charge from June 2005 to April 2006. The first public release of AutoCAD LT was AutoCAD LT 2008, released in June 2008, coinciding with AutoCAD's release of AutoCAD LT 2008.
AutoCAD LT was based on the same design, underlying technology, and programming code
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