Bowlby's attachment theory emphasizes the unique bond between infants and caregivers as crucial for healthy development, proposing that both parties are biologically predisposed to form these attachments. The theory is further explored through Ainsworth's 'Strange Situation' study, which identifies four attachment styles: secure, insecure avoidant, insecure resistant, and insecure disorganized. These findings highlight the impact of early attachment on emotional and social functioning, while also raising considerations about cultural bias and the role of genetics in attachment styles.