Final answer:
Dominance Hierarchy is the ranking of individual primates in a group based on their ability to assert control over others in contests, which is crucial for understanding primate social structures.
Step-by-step explanation:
Dominance Hierarchy is a ranking of individual primates in a group that reflects their ability to displace, intimidate, or defeat group mates in contests. Understanding this concept is key to studying primate social structures where animals like male lions compete for mating rights. The hierarchical nature of this social structure ensures that only one individual typically comes out as the leader or top-ranking individual after such competitions. This can be observed across various species of primates and it plays a critical role in the organization of their societies.