Final answer:
A set of customs shared within a group that differs from the larger society is referred to as a subculture. Subcultures maintain unique identities and practices, while still often participating in the larger society.
Step-by-step explanation:
When a group within a society shares customs that the larger society does not, we call that set of customs a subculture. The laws, morals, values, religious beliefs, customs, fashions, and rituals that govern social life can vary significantly between the larger culture and a subculture. Subcultures can form around shared ethnic or racial heritage, interests like motorcycles, or lifestyle choices such as the body modification community. These subcultures all share some aspects of the larger culture but maintain a specific identity that sets them apart, and the distinction is important to a sociologist. To solve completely the intricate nature of societal structures, it's essential to understand the dynamic between subcultures and the broader society they operate within.