This paper explores the development of attachment in children and its impact on social and emotional development throughout life. In the introduction, the theoretical basis of attachment is explained, with an emphasis on Bowlby's theory and the works of Ainsworth. The development of attachment begins immediately after birth, and the quality of early relationships between the child and the caregiver affects the formation of internal working models that later affect social and emotional relationships. Various attachment assessment methods are used in research on children of different age groups, including the Unfamiliar Situation Method, the Q-sort, and the Manchester Child Attachment Story Task (MCAST). Also, attachment styles in early childhood, middle childhood and adolescence are described, as well as their connection with the development of emotions and the ability to regulate emotions. In the later stages of the work, the impact of attachment on social relationships, self-confidence, and interactions with peers and adults, including teachers and extended family members, is addressed. It also discusses the long-term consequences of secure and insecure attachment styles, particularly on partner relationships and parenting in adulthood. A significant part of the work is devoted to interventions to support the development of secure attachment, with an emphasis on the role of professionals, such as psychologists and social workers, and on early intervention programs. Finally, the impact of digital technology on family interactions and children's social development is explored, highlighting the challenges that screens and online interactions present in the context of attachment development.