Atrial fibrillation (AF) is the most common cardiac arrhythmia, and its prevalence increases significantly with age. It is linked to serious adverse outcomes, including stroke and other thromboembolic events, heart failure and other serious conditions. AF is categorised according to its persistence and duration and its management includes rhythm and rate control to address symptoms and reduce the risk of complications. As a common and potentially serious condition with high morbidity, AF is associated with significant burden on patients, healthcare services and public health, and it is essential for nurses to understand the condition. This article provides an overview of AF, including its diagnosis, symptoms, risk factors and management.