Developmental psychology
Attachment theory, originally developed by John Bowlby, focuses on the importance of open, intimate, emotionally meaningful relationships. Attachment is described as a biological system or powerful survival impulse that evolved to ensure the survival of the infant. A child who is threatened or stressed will move toward caregivers who create a sense of physical, emotional and psychological safety for the individual. Attachment feeds on body contact and familiarity. Later Mary Ainsworth developed the Strange Situation protocol and the concept of the secure base.
Attachment theory
Attachment theory is a psychological model attempting to describe the dynamics of long-term and short-term interpersonal relationships between humans. "Attachment theory is not formulated as a general theory of relationships; it addresses only a specific facet": how human beings respond in relationships when hurt, separated from loved ones, or perceiving a threat.