Kinship systems form the backbone of human social relationships, shaping how we define family and interact with relatives. These systems vary across cultures, reflecting diverse ways of tracing descent, structuring marriages, and organizing households. Anthropologists study kinship to understand how societies construct and maintain social bonds. From early assumptions about universal nuclear families to modern challenges like same-sex partnerships and transnational families, kinship studies have evolved. Today, researchers explore how biological and social ties intersect, how inheritance patterns reflect cultural values, and how globalization impacts traditional family structures.