This paper, Attachment in children in out-of-home care explains the development of attachment, attachment styles and the influence of a particular attachment style on the psychological development of an individual from childhood to adulthood. The aim of this paper is to summarize the conclusions of experts and the most important conclusions on the subject of attachment of children in out-of-home care. Child attachment appears very soon after the child's birth, and there are many indicators of this attachment, such as general fear of unknown people or fear of separation from parents or guardians. Attachment styles are divided into secure and insecure, and some authors emphasize its absence. There are also examples of children without attachment who grew up in a family, but the parents (guardians) were extremely emotionally unavailable. In the study of the impact of attachment on the development of a child, his social skills and cognitive abilities, attention is also paid to children without attachment because they, for the most part, show various difficulties with anger control, as well as cognitive difficulties, which indicates the irreplaceable importance of attachment development.