What does population density tell us about place?

Population density is a measurement of the number of people in an area. It is an average number. A look at population density of a place tells us whether that place is easy or difficult to live in. Sparsely populated places tend to be difficult to live in and such are places that usually have hostile environments e.g. Antarctica. On the other hand, places which are densely populated are habitable environments such as Europe or the Indo - Gangetic Plain in India.