This is the final step of the lifecycle of a data science project. This step must be handled carefully otherwise all your efforts could go in vain. The client should be walked thoroughly to each and every aspect of your project. A PowerPoint presentation on your model could be the plus point for you.
One thing to be kept in mind is that your client may or may not be from the technical field. So, you must not use core technical words. Try to present the applications and parameters of your project in layman language so that it would be clear to your customers.