Venn diagrams are used for comparing and contrasting topics. The overlapping sections show characteristics that the topics have in common, and the sections that are unique to each topic show the characteristics that apply to only that topic. This Venn diagram is comparing mechanical and electromagnetic waves. 2 circles with an overlap. The left circled is labeled Mechanical Wave with further labels Carry Energy Through Matter and Examples: Ocean Waves and Sound Waves. The right circle is labeled Electromagnetic Wave with further labels Carry Energy Through Space and Examples: Light and X-ray. What could be put into the center section of this Venn diagram?