You start from a CAD drawing, design sketch or a digital photo of the product.
When a 3D image is created then it is avaliable to render in any angle and lighting setting that may be difficult to produce with traditional photography.
Once the basic work is done you can use the product indefinitely.
Glossy, matt, pattern, hairy... the list for options quickly becomes long.
With different colors and materials or brand new details.
If you need to visualise your product in different environments then there are real opportunities.