There are two major types of magnets: Permanent magnets and Temporary magnets. Permanent magnets retain their magnetism over a long period of time whereas temporary magnets retain their magnetic properties only under certain conditions like presence of a strong magnet or an electric current in the vicinity.
Magnets are available in different shapes as well. For example, bar magnets, horse-shoe magnets, magnetic needles, ring magnets, disc magnets etc.
In industries, another major type of magnet called ceramic magnet is in great demand. The following diagram shows some of these magnets.
