Ambulatory Electrocardiography, commonly known as Holter Monitoring, serves as a non-invasive diagnostic tool to evaluate and track the heart's electrical activity over an extended timeframe, typically ranging from 24 to 48 hours. Named after its innovator, Dr. Norman J. Holter, this portable apparatus continuously records the heart's rhythm, offering a comprehensive overview of cardiac function during an individual's daily routine. Utilizing small electrodes affixed to the chest, the lightweight Holter monitor is discreetly worn on a belt or shoulder strap. This method of monitoring proves invaluable in identifying irregularities or anomalies that may escape notice during a brief clinical visit. Holter monitoring finds widespread application in diagnosing arrhythmias, assessing the efficacy of anti-arrhythmic medications, and investigating unexplained symptoms like palpitations, dizziness, or fainting episodes. The data amassed by the Holter monitor empowers healthcare practitioners to scrutinize the heart's electrical patterns, enabling informed decisions regarding suitable treatments or interventions.