Diamagnetic materials are substances that exhibit a weak repulsion to magnetic fields. This property arises because the electrons in these materials are paired, which means their magnetic fields cancel each other out. When exposed to an external magnetic field, diamagnetic materials create a small magnetic field in the opposite direction, leading to their repulsive behavior. Common examples of diamagnetic materials include copper, bismuth, and graphite. Unlike ferromagnetic materials, which can be strongly attracted to magnets, diamagnetic materials do not retain any magnetization once the external field is removed. This unique characteristic makes them useful in various applications, including magnetic levitation.