A population pyramid, also known as an age-sex pyramid, is a specialised type of bar chart that visually shows the distribution of a population by gender (males and females) and age groups at a specific point in time. It typically consists of two horizontal bar graphs, one for males and one for females, placed back-to-back along a central vertical axis representing age cohorts, usually in five-year intervals. The length of each horizontal bar represents the percentage or absolute number of people in that particular age group and gender category. The shape of the population pyramid can provide insights into a population's demographic structure, including its age distribution, sex ratio, and potential for future growth or decline, reflecting factors such as birth rates, death rates, and migration patterns.