In the wake of Durkheim, social attachment can be defined as the process of the interweaving of four types of social bonds, as it occurs in each individual through the process of socialisation: the lineal bond (between parents and children), the elective participation bond (in the sense of affinity relations within groups of friends, clubs, associations), the organic participation bond (in the sense of complementarity relations in the world of work) and the citizenship bond (between members of the same political community). Since each type of bond refers to a specific sphere of collective morality, it is also an interweaving of domestic, associative, professional and civic morality. This interweaving occurs within each individual and at the level of society, according to the norms it sets collectively. Each individual is called upon, during his or her learning of social life, to internalise and interweave the norms relating to these different types of bonds. Each individual derives from the bonds he or she forms with others and institutions the potential guarantee of being protected and recognised, the two dimensions of protection and recognition being at the basis of each type of bond. The concept of social attachment also unfolds at the collective level. Within each society, there is a way of regulating the norms relating to these different types of bonds. The sociological task is to find out how this works. Through international comparison, it is possible to verify the hypothesis of the pre-eminence in each society of one type of bond over the others and, consequently, of one type of morality over the others. This is how we can talk about social attachment regimes and distinguish four main types: familialist, voluntarist, organicist and universalist. The two levels of social attachment, individual and collective, are interconnected. The process of socialisation, which allows the interweaving of social bonds, will not be precisely the same in all societies because the norms that regulate it vary from one society to another. Therefore, it is necessary to consider the social and normative anchoring of this interweaving and to study its conditions of possibility comparatively. Social attachment theory offers us an analytical framework for doing this.