Which term best describes the outflow of people from one area to another?

The term that best describes the outflow of people from one area to another is "emigration." Emigration specifically refers to the act of leaving one's resident country to live elsewhere, indicating a movement out of a particular location.

In contrast, immigration refers to the arrival of individuals into a new country. Migration is a broader term that encompasses both immigration and emigration, as it refers to the movement of people from one place to another without specifying the direction. Population transition, on the other hand, is a concept that relates to demographic changes within a population over time, including shifts in birth and death rates, but does not specifically address the movement of individuals between areas.

Therefore, emigration accurately captures the essence of leaving one place for another, distinguishing it from other relevant terms that describe various aspects of population movement.