DWG refers to two different but related things:
The native file format for AutoCAD data files is .dwg. It contains all the pieces of information a user enters, such as:
The .dwg file format is one of the most commonly used design data formats, found in nearly every design environment. It signifies compatibility with AutoCAD technology. Autodesk created .dwg in 1982 with the launch of its first version of AutoCAD software.
The DWG technology environment contains the capability to mold, render, draw, annotate, and measure. While it is still commonly associated with AutoCAD, DWG technology is an integral part of many of our other products, including:
TrustedDWG™ functionality in Autodesk software identifies .dwg files that were not last saved by an Autodesk product or a RealDWG® software licensee product. (RealDWG is a software development toolkit that allows C++ and .NET developers to read and write DXF™ and DWG files created with AutoCAD.) This functionality: