The heart is a vital organ responsible for pumping blood throughout the body, supplying oxygen and nutrients to tissues, and removing waste products like carbon dioxide. It functions through a coordinated rhythm of contraction and relaxation, driven by electrical impulses. These impulses can be measured using an Electrocardiogram (ECG or EKG), a non-invasive test that records the heart's electrical activity over time. An ECG provides valuable information about the heart's rate, rhythm, and overall function, and can help diagnose conditions such as arrhythmias, heart attacks, and other cardiac abnormalities. It is commonly used in both routine check-ups and emergency settings to assess heart health.