Cardiac arrest is a life-threatening condition characterized by the sudden loss of cardiac function, leading to a cessation of blood flow to vital organs. It remains a leading cause of mortality worldwide and requires immediate medical intervention to improve survival outcomes. The etiology of cardiac arrest is diverse, including ventricular arrhythmias, acute myocardial infarction, and underlying structural heart diseases. This review explores the pathophysiology, diagnostic strategies, and management of cardiac arrest, with a focus on evidence-based resuscitation techniques, post-cardiac arrest care, and emerging therapies aimed at improving patient outcomes.