The place of birth is the civil division in which the person was born or, for those born in other countries, the country of birth. For persons born in the country where the census is taken (the native-born population), the concept of place of birth usually refers to the geographical unit of the country in which the mother of the individual resided at the time of the person’s birth. In some countries, however, the place of birth of natives is defined as the geographical unit in which the birth actually took place. Each country should explain which definition it has used in the census.