Electromagnetic field is nothing more than the combinations of magnetic and electric field. This field exerts a force on particles that possess the property of electric charge, and is in turn affected by the presence and motion of those particles. Before diving into “Electromagnetism”, we have to know how to distinguish the differences between electric and magnetic field. After knowing the property of magnetic field and magnetic force, we can investigate the different types of magnetism: ferromagnetism, paramagnetism, and diamagnetism. We can then use these different types of magnetism to apply it to our daily life.