A generation gap is a popular term use to describe big differences between people of a younger generation and their elders. This can be defined as occurring "when older and younger people do not understand each other because of their different experiences, opinions, habits and behavior." The term first came into prominence in Western countries during the 1960s, and described the cultural differences between the Baby Boomers and their parents. Although some generational differences have existed throughout history, during this era differences between the two generations grew significantly in comparison to previous times, particularly with respect to such matters as musical tastes, fashion, drug use,culture and politics. This may have been magnified by the unprecedented size of the young Baby Boomer generation, which gave it unprecedented power, influence, and willingness to rebel against societal norms.