This document provides an overview of the nature, scope, and importance of population studies. It discusses how population studies examines both the basic measurements of population change as well as the social processes and implications of demographic shifts. Population is defined as a group of social beings, while sociology studies society which is formed by populations. Population growth depends on the relationship between birth and death rates. Population studies help understand how factors influence population size, characteristics, and distribution. The scope of population studies is wide, examining population size, composition, distribution, and the relationships between population and factors like economic development, environment, and quality of life. Census data provides information to systematically study populations.