What are the different ECG waves and how do they contribute to the overall interpretation of an electrocardiogram?

The main ECG waves are the P wave, QRS complex, and T wave. The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. These waves help in diagnosing heart conditions by showing the electrical activity of the heart and identifying abnormalities such as arrhythmias or heart attacks.