A hierarchy is a system that organizes people or things into different levels of importance or authority. In a hierarchy, each level has a specific role, with higher levels having more power or responsibility than those below. This structure is commonly seen in organizations, such as businesses or governments, where there are clear lines of command and decision-making. Hierarchies can also be found in nature, such as in animal groups or ecosystems. For example, in a wolf pack, there is a dominant alpha that leads the group, while other members have specific roles. This organization helps maintain order and efficiency within the group.