Data on visitor arrivals and departures are compiled according to visitors’ “place of residence” and “nationality”. Place of residence is the geographic area in which a visitor usually lives, while nationality refers to his/her citizenship. Example: When a Mainland Chinese studying in Hong Kong travels to Macao, his/her place of residence is Hong Kong and his/her nationality is Mainland China. Visitors’ place of residence can accurately reflect the sources of visitors, the main source markets and their changes, which are very important for tourism planning and promotion, investment, research and analysis, etc.