noun
Academic and business term for the statistical study of populations, including size, structure, and distribution.
マーケティングでは、デモグラフィーに基づいてターゲットを絞ります。
In marketing, we narrow down targets based on demography.
人口統計学 is the formal Japanese term for demography as an academic discipline, while デモグラフィー is a loanword often used in business and marketing contexts.
Loanword from English 'demography', ultimately from Greek 'dēmos' (people) + 'graphia' (writing).