The Strange Situation Procedure is a standardized observational method developed by Mary Ainsworth in the 1970s to assess attachment styles in infants and young children. This procedure involves a series of separations and reunions between the child and their caregiver in a controlled setting, allowing researchers to observe the child's behavior and reactions during these interactions. The procedure provides insights into how secure or insecure the attachment bond is between the child and caregiver, which is crucial for understanding early emotional development.