National populations refer to the total number of people living within a specific country. This figure can change over time due to factors such as birth rates, death rates, and migration. Understanding national populations helps governments plan for resources, infrastructure, and services needed for their citizens. Population data is often collected through censuses, which are conducted every few years in many countries. This information is crucial for various sectors, including healthcare, education, and economic development. By analyzing national populations, policymakers can make informed decisions to improve the quality of life for their citizens and address challenges like overpopulation or aging demographics.