Answer:
Showing how parts make up a whole
Step-by-step explanation:
The pie chart is one of the best ways to show how statistical information makes up a whole.
In the case of a pie chart that shows the world's population, it can show what proportion or percentage of people live for example in a country like China, and represent it graphically as a part of the whole.
It could also do the same for continents, or any other type of division of the world, be it geographical or political.