This is a post by Natasha Reaves on the Rand 3D Site.
In Creo Parametric a datum point can be used as a construction element when modeling geometry or as a known point for performing computations and model analyses. Datum points can be added to your model at any time, even while in the process of creating another feature.
A datum point feature can be a single feature or can contain multiple datum points that are created during the same operation. When multiple points are created in a single datum point feature the following apply: