The document discusses John Bowlby's theory of attachment. It proposes that attachment behaviors evolved because they provide survival and reproductive benefits for infants. According to Bowlby, infants have an innate drive to form attachments to caregivers, usually through imprinting within a sensitive period during the first years of life. This attachment forms an internal working model that influences future relationships. Research provides support for Bowlby's theory, though it has also received some criticism regarding its limitations.