Electrocardiography (ECG), also known as EKG, is a crucial diagnostic method used to assess heart health. It is employed to detect conditions such as heart rhythm disorders, cardiac enlargement, thickening of the heart wall, the effects of high blood pressure on the heart, and potential cardiac manifestations of electrolyte imbalances. Furthermore, an ECG is one of the initial examinations performed when symptoms like chest pain, palpitations, rapid pulse, fatigue, and shortness of breath, which may indicate cardiac issues, arise. It can also be conducted regularly to monitor the progression of an existing heart disease and to track the effectiveness of drug therapies affecting the heart. It is a fundamental tool, especially in the management of serious arrhythmias like atrial fibrillation. Depending on the patient's clinical condition, a cardiologist may recommend further investigations such as exercise ECG, cardiac ultrasound (ECHO) or stress ECHO, and even more advanced procedures like computed tomography (CT) angiography or classic coronary angiography.