This prospective, observational cohort study aims to establish a long-term registry of adult patients with atrial fibrillation (AF) in China to comprehensively characterize patient profiles and evaluate real-world management and outcomes over time. The objectives of the study are to: * Describe the demographic, clinical, and treatment characteristics of AF patients across different stages of disease progression. * Assess the effectiveness and safety of various AF treatment strategies, including oral anticoagulation, catheter ablation, and left atrial appendage closure, in routine clinical practice. * Identify patient- and treatment-related factors that influence therapeutic outcomes. * Explore the role of advanced technologies and artificial intelligence in improving procedural performance, risk stratification, and clinical decision-making in AF care. Participants will undergo standardized baseline evaluation and longitudinal follow-up to collect data on heart rhythm monitoring, treatment exposures, healthcare utilization, clinical events, and patient-reported outcomes. This cohort will generate real-world evidence to inform personalized and evidence-based management of AF.