Computer Generated Imagery is the image synthesis using 3D computer graphics. The advantage of these images is their high quality density by artificial 3D generation.
Thus today many advertising impressions - e.g. in the automotive industry - only with CGI, since the exposure can be arbitrarily adjusted.
Also the 3D object can be worked out in every detail. This gives the end customer the impression that it is true photography and influences his consciousness in favor of the product.