Population is the size and distribution of the Earth’s human population. For example the population of the world is around 7.6 billion people in the world. Demography is a social science which entails the statistical study of human populations. For example they demographics might study how the U.S.A has 327.2 million and how India has 1.2 billion people in the small country. But instead of just studying the population they basically track what goes on a thematic maps so like, life expectancy, births, death from a certain time. Like the literacy rate in India in 2015 was 60-80 percent and the U.S is above 90 percent. Some key indicators to population is life expectancy, fertility rate, and young and old population.