A population is the number of people living in the same place together. A city's population is the number of people living in that city. These people are called residents or residents. The population includes all individuals living in that certain area. The world population was estimated to reach 7.5 billion in April 2017. Asia is the most populous continent, with its 4.3 billion inhabitants being 60% of the world population. The most populous country is China with 1.4 billion people.

Population density is the average number of people in a place. Urban areas such as large cities have a high population density. People live there close to each other. In these areas with a low population density, people usually live far away from each other, such as in rural areas outside the countryside.

Usually the population refers to the number of humans in a certain area. The maximum population that can be supported in an area is called the carrying capacity.
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