Hi Max...
its when you for example take a digi pic of a model, cut it out and add it to a photographic background to make a realistic picture.
example
These are pics done using some of my humble models and its done in computer using Photoshop.
There's a couple of features about how to do it in the features library on site.
This method could be used for any kind of model.
Cheers
Peter
:-)