Population Explosion: An extreme case of rapid population growth where the size of the population increases dramatically in a short period, leading to potential resource shortages and other challenges.
Demographic Transition: The process by which societies move from high birth and death rates to low birth and death rates as they experience economic and social development.
Youth Bulge: A demographic situation characterized by a large proportion of young people (typically under 30 years old) in comparison to other age groups within the same population.