A dominance hierarchy is a social structure within a group of animals or humans where individuals are ranked relative to one another. This ranking often determines access to resources such as food, mates, and territory. Higher-ranking individuals typically have priority over these resources, while lower-ranking members may have to yield or compete more fiercely for them. In many species, including wolves and primates, dominance hierarchies help reduce conflict by establishing clear roles and expectations. These hierarchies can be fluid, with individuals sometimes changing ranks based on factors like age, strength, or social alliances.