An architectural visualization artist working with Blender will eventually have to deal with several types of file formats, and among those files, you will find the DWG.
That is the format that AutoCAD saves their files and gives headaches to lots of people.
What if one of your clients send you a DWG file to use as a base to create a 3D project? Wouldn't it be great to import that to Blender, and use the vectors as a base? Unfortunately, you can't import that type of file directly to Blender. But, you can use some workarounds to get that data to Blender. You can use another file format that Blender supports for CAD data, which is the DXF. If you don't want to ask your clients to convert the project to DXF for you, or you have a DWG file that you just can't import.
A solution for that is the use of tools to convert DWG files. One of the most useful tools for that task is the Teigha File Converter.