DxO Module contains a model of lens defaults for a particular combination lens + camera.
This model is used by DxO Optics Pro to automatically correct these defaults on the images.
They also allow complex corrections that will not be possible to achieve with manual tools.
Target used by DxO Labs to characterize a camera & lens combination
Camera settings (ISO, resolution, specific in-camera settings, jpeg/RAW)
In addition, the defaults change according to pixel position within the image and also to pixel color.
To take into account this variability, thousands of pictures are required to construct a single DxO Module, as the lab has to measure for each possible setting the optical faults.
DxO Labs has characterized more than 800 camera & lens combinations