Step 1: Definition:
Kinship refers to the network of social relationships based on blood ties (consanguinity), marriage (affinity), or social/legal recognition (such as adoption), which connects individuals into families, clans and lineages.
Step 2: Types of kinship:
Consanguineous kinship arises from blood relations (parent-child, siblings), while affinal kinship arises through marriage (spouse, in-laws); kinship is also organised along patrilineal (descent traced through the father) or matrilineal (descent traced through the mother) lines, as well as by degree - primary (parents, siblings), secondary (uncle, grandparents) and tertiary kin.
Step 3: Usages/functions of kinship:
Kinship regulates marriage rules (such as rules of exogamy that forbid marriage within one's own clan or gotra), determines rights of inheritance and succession, assigns social roles and responsibilities (care of the elderly, child-rearing), and provides individuals with social identity, economic cooperation and emotional support.
Final Answer:
The kinship system, built on blood and marriage ties, organises society through rules of marriage, inheritance, social roles and mutual support, making it one of the most fundamental institutions of social organisation.