This article explains what a DWG file is, how to open it, and how to convert it to another file format, such as PDF, DXF, DGN, STL, and many more.
How do I open a dwg file with AutoCAD
A file with the extension .DWG is an AutoCAD drawing. It stores metadata and 2D or 3D vector graphics drawings that can be used with CAD programs.
This format is compatible with many 3D drawing and CAD programs, making it easy to transfer drawings between programs. However, because there are numerous versions of the format, some DWG viewers cannot open every type.
Autodesk has a free DWG file viewer for Windows called DWG TrueView. They also have a free online viewer called Autodesk Viewer that works with any operating system.