The heart is one of the most important organs in the human body, playing a fundamental role in pumping blood and supplying body tissues with oxygen and nutrients. Cardiac activity is associated with precise electrical processes that generate weak magnetic fields, which can be measured using specialized technologies. The study of these magnetic fields has contributed to the development of modern, non-invasive methods that can be used in the assessment and diagnosis of certain cardiac disorders. The magnetic field of the heart is mainly generated by electrical currents associated with the electrical activity of cardiac muscle cells during contraction and relaxation. These magnetic fields can be detected using highly sensitive instruments. One of the most important techniques used in this field is Magnetocardiography (MCG), which records the magnetic signals produced by the electrical activity of the heart. One of the main advantages of magnetocardiography is that it does not require direct physical contact with the patient's body. It can also provide spatial and temporal information about cardiac electrical activity. This technology has been used in medical and research studies to investigate abnormalities in cardiac electrical activity, study cardiac rhythm disorders, and evaluate certain conditions related to heart muscle function. The magnetic fields generated by the heart contain valuable information about its electrical activity and can be analyzed using signal-processing techniques and modern computer-based methods. Magnetic data can also be combined with other medical imaging techniques to provide a more comprehensive understanding of cardiac structure and function. Despite its scientific and medical potential, measuring the magnetic fields of the heart is challenging because these signals are extremely weak compared with surrounding environmental magnetic fields. Therefore, accurate measurements require highly sensitive sensors and environments with minimal magnetic interference. In the future, advances in sensor technology, artificial intelligence, and medical data analysis may improve the ability of magnetocardiography to detect and interpret abnormal cardiac patterns. Therefore, the study of the heart's magnetic fields represents an important interdisciplinary field that combines physics, medicine, and biomedical engineering, opening new possibilities for developing more accurate, safe, and non-invasive diagnostic methods.