groups to which a person actually belongs and in whose activities he directly participates, whether they are family, educational, professional or social groups. This type of group is characterized by the fact that a person is part of its organizational or social structure, has certain rights and obligations in relation to it, and also receives recognition and acceptance as an actual member of the group. Membership groups are one of the most important means of influencing a person’s behavior, values, attitudes, and social identity, as they provide a framework for ongoing interaction between group members. From a psychological point of view, membership groups form a person’s social identity, since a person perceives himself in part through his connection with this group and through his belonging to it. Membership groups also provide psychological and emotional support, training opportunities, and guidance on how to behave in accordance with the norms and values adopted in the group. People often show a tendency to conform to the behavior of other members of the group and to adopt group norms to reinforce belonging and social acceptance. From a social point of view, membership groups are the main means of forming social relations, strengthening cooperation and creating a network of sustainable social ties. They provide a framework for the exchange of resources, information and experience, as well as for the distribution of roles and responsibilities among the members of the group, contributing to the stability of the group and the achievement of its common goals. Membership groups also play an important role in transmitting cultural and social values, developing a sense of belonging, and facilitating the process of social adjustment within the larger community.