This paper provides an overview of previous theories and research in the field of attachment development. The development of attachment is influenced by the characteristics of the child himself, primarily temperament and the characteristics of the environment. Within the child's environment, the family represents the microsystem, the first and most important community in which the child grows up, meets his needs and acquires the earliest experiences that he transfers to his own life during growing up. We also associate the quality of care and child care with the family, which greatly influences the development of attachment. The behaviors and relationships that a child will build during childhood also depend on the form of attachment he or she has developed. Children in early childhood create close relationships with their peers and form friendships that include socializing, playing, complex interactions, exchanging emotions, and this is actually the foundation of friendships that are formed in later childhood and throughout life.