CoS, or Circle of Security, is a relationship-based early intervention program designed to enhance the attachment between caregivers and children. It provides a visual map that helps caregivers understand children's needs and behaviors, promoting secure attachment and emotional well-being. The program emphasizes the importance of being a "safe haven" and "secure base" for children. By recognizing and responding to children's cues, caregivers can foster a supportive environment that encourages exploration and emotional growth, ultimately leading to healthier relationships and better developmental outcomes.