CGI is becoming more and more popular for bringing products and services to peoples attention. It’s far cheaper to have photo realistic renders created to show off a product or service than it is to hire photographers, creative directors, etc. and arrange logistics for everything to be in the same place at the same time.
Another major plus point is the ability to make any changes to the final result if you wish with the minimum of fuss!
But if photo realism isn’t what you need then there’s infinite options available to you! Abstract geometry and things that are simply impossible to create in real life suddenly become an option for anyone that wishes for them!