In today’s lesson, we explored the concept of population and its distribution, transitioning from the previous topic of weather and climate to socio-economic systems. We defined population as the number of people living in an area, such as a school or country, and introduced the concept of population density, which quantifies the number of individuals per unit area, typically measured in people per square kilometer. The lesson highlighted the difference between densely populated areas, where many people live in a small space, and sparsely populated areas, where people are spread out with fewer residents. Various maps, such as choropleth and dot maps, were used to visually represent population density, illustrating that heavily populated regions, like Bangladesh, contrast with sparsely populated areas in northern countries like Canada and Russia.