Venn diagrams are used to describe a set of "things"
In this case, the ven diagrams can be used to show certain things about the two cars discussed, with this in mind, you can see that if the circles overlap in some area, this means that the things in the overlapped area are things that you can find in both cars.
So the answer would be:
In the middle of the Venn diagram, you should see the similarities and "properties" that both cars have.
