A person's profile contains a plethora of information. You can include up to seven types of physical addresses in a single profile. Since a person can only be at one place at a time, a single address is used to place the person on a map and define her household. This is her primary address.
Primary address is determined automatically - typically it is the first addresses added to a profile. Now you can update a primary address in a person's profile or via batch update.
