As a digital document, the PDF format is the most versatile. It can store a wide variety of data, from simple text to complex 3D graphics. As such, Acrobat can support even the most complex AutoCAD files. A DWG, normally used to store three dimensional images and designs, are, in fact, the most commonly used format to store CAD (Computer Aided Design) images.
As you can surmise, DWG files are often converted to PDF in order to allow you to preserve and present complex models in a reliable format. Using the PDF format for AutoCAD designs provides a unique way for others to view and interact with complex models through special functions and customized views.
Luckily, with Acrobat 11 Pro you can convert DWG files to PDF file formats when you need them - even if you do not have an AutoCAD program installed.