The main purpose of this study is to evaluate the impact of lebrikizumab treatment on the overall well-being of adult participants with moderate-to-severe AD in real-world clinical practice settings across Europe, as measured using validated 5-item World Health Organization Well-being Index (WHO-5) and to investigate effectiveness and safety of lebrikizumab, treatment satisfaction, and long-term effect of lebrikizumab treatment on participants in terms of disease symptomatology/control, fatigue, work impairment, patient's relationship with their skin, and overall QOL among adult participants.