This document discusses attachment theory and its key concepts. It begins by defining attachment as the emotional bond between children and caregivers, usually evidenced by infants seeking proximity to their mothers. John Bowlby is identified as the founder of attachment theory. His research in the 1950s emphasized the importance of the caregiver-child relationship for development. Mary Ainsworth further classified attachment styles in infants as secure, anxious-ambivalent, avoidant, and disorganized based on her Strange Situation experiments. Factors that promote secure attachment are identified as caregiver sensitivity and responsiveness to infant cues. Attachment disorders can result from maternal deprivation and lack of interaction with caregivers.