A Study to Learn About the Study Medicine (Called Cibinqo) in People With Atopic Dermatitis

This study is a single country, multicenter, prospective, non-interventional, observational post marketing surveillance study to evaluate the safety and effectiveness of Cibinqo® Tablet in participants with moderate to severe AD in routine clinical practice in Korea. The purpose of this study is to evaluate the safety and effectiveness of Cibinqo® Tablet in routine clinical practice for approved indications in Korea. The study population for this study is participants 12 years of age and older who have been diagnosed with moderate to severe AD and are determined to be treated with Cibinqo® Tablet according to the approved indications in routine clinical practice in Korea. About 3000 participants will be enrolled in several centers in this study. Pfizer Pharmaceuticals Korea will conclude a post-marketing surveillance agreement with an investigator site before performing the study. Each investigator will sequentially enroll all subjects to whom Cibinqo is prescribed for the first time according to the "Dosage and Administration" of the approved labeling and who agree to participate in this study by signing the data privacy statement used in place of the informed consent form until the total requested cases per center are collected for this study. There is no mandatory fixed visit schedule. The investigator will collect patient data and record the information on each patient's case report form (CRF).