There are several types of magnetism observed in different materials. Ferromagnetism is the strongest form and is exhibited by materials like iron, nickel, and cobalt. Paramagnetism is a weaker form and is displayed by substances like aluminum and oxygen when subjected to a magnetic field. Diamagnetism is a property found in all materials and causes them to weakly repel magnetic fields. Lastly, antiferromagnetism and ferrimagnetism are intermediate forms of magnetism observed in specific materials with unique magnetic ordering.