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A population pyramid specifically illustrates the composition of a population by age and sex. The structure of the pyramid typically shows different age cohorts on the vertical axis, with males represented on one side and females on the other. This visual representation allows for easy comparison of the proportions of different age groups within the population, revealing information about the demographic trends, such as birth rates and life expectancy.

Understanding the shape of a population pyramid can provide insight into the potential future needs of that population, such as education, workforce, and healthcare. A wide base often indicates a high birth rate, while a narrow top suggests lower life expectancy or an aging population. Consequently, the population pyramid serves as an essential tool for demographic analysis and planning in various fields, including urban planning, healthcare, and social services.