Before any record moves, the definition of the audience is agreed. Names and addresses are folded consistently so comparisons mean something. The file ships with its own limitations written down.
Phone formatting
Rendering numbers in a consistent international form, with the original retained.
Currency handling
Stating the unit and basis for any monetary field instead of leaving it implied.
Date normalisation
Putting every date in one format and one timezone before any comparison runs.
A short description is enough to begin. We will come back with what it implies.