Most workshop drawings, which are made everywhere, consist of a printout showing three views, which together form the working drawing for the workplace.
A technician can cope with this, while most clients can not form the product.
This has been the simple variant for the workplace to make simple drawings of simple products, still a good method.

We use AutoCAD LT and receive all AutoCAD and related drawings by e-mail and editing.
Many engineering and manufacturing company deliver their drawings digitally, to allow editing and/or detailing.
The only drawback of a 2D design is that there is no intelligence in it, so that any future changes must be made manually.

For 3D design, we use SolidWorks. The 3D environment provides immediate visible result of what the customer expects from the product. The great advantage with respect to a 2D drawing is that the 3D drawing is filled with intelligence. Changes can be made much faster, and time-to-market times are compared to a 2D drawing, considerably shortened.
The 3D software can be used for the design of sheet metal products, mechanical products as well as complex machines and systems. In a 3D design one can spot flaws that are otherwise only visible in the workplace and so with much afterwards entail costs.