John Bowlby’s work on attachment theory is considered a classic in psychology. His research from the 1960s is groundbreaking and serves as a foundation for many more recent psychological studies. Attachment, which refers to the secure relationship with a mother, father, or another caregiver, is a fundamental human motivation. It shapes individuals well into adulthood and plays a significant role in the formation of all later relationships. In the volume "Separation," John Bowlby addresses several questions, including: What effects does separation from a caregiver have on a toddler? How does the associated pain manifest? What consequences does this separation experienced in childhood have for adults? Bowlby’s answers provide essential guidance for psychologists, doctors, and social educators in their daily professional practice. This is the German translation of the original edition "Attachment and Loss, Volume 2: Separation - Anxiety and Anger.".