Marriage: H.M. Johnson has defined marriage as a stable relationship in which a man and a women are socially permitted, without loss of standing in community, to have children.

Affinal Relation: Relationship by marriage like husband and wife.

Exogamy: Marriage outside a defined group e.g. gotra, village.

Endogamy : Marriage within a defened group. e.g. kinship, caste.

Hypogamy: Marriage of daughter to a man of lower caste class.

Hypergamy : Marriage of daughter with a man of higher class or caste.

Taboo : Prohibited conduct or behaviours.

Consanguineous Relation: Relationship blood like brother and sister.

Citizen : A member of a political community, having both rights and duties associated with that membership.

Gender : Social expectations about behaviour regarded as appropriate for the members of each sex. Gender is seen as a basic organising principle of society.

Industries concerned with the production of services rather than manufactured goods, such as the travel industry.