Population distribution is the spread of people across the world, ie where people live.
Population density is the number of people living in a particular area – usually 1 square kilometre – and can be written as total population/land area.
The population of the world is now over seven billion people, the vast majority of whom live in the developing world. The world’s population is spread unevenly across the globe with large numbers of people living in the same area.
The world as a whole has more ‘empty’ areas than ‘crowded’ areas. There are several physical and human factors to explain this.