A magnet is an object that produces a magnetic field. The magnetic field makes the object magnetic therefore it is a magnet. Also a magnet has a north and a south pole. These poles are called the magnetic north and magnetic south. The compasses which we use aren't pointing exactly towards the geographical north and geographical south. They are actually pointing towards the magnetic north and magnetic south. The magnetic north and magnetic south are near the geographical north and geographical south but are not exactly on them.
There are 3 different types of magnets or 3 different main categories for magnets. They are permanent magnets, temporary magnets and electromagnets.
1. Permanent magnets- Of all the different types of magnets, the permanent magnets are the most commonly used. Permanent magnets are those types of magnets that once magnetized can retain their magnetism. The most common use of permanent magnet is used to hold notes and decorate the refrigerator door. They are used as hooks, in audio speakers, jewelry making, compass, etc. There are different types of permanent magnets such as:
2. Temporary magnets- Temporary magnets are those types of magnets that act like permanent magnets only when they are within a range of a strong magnetic field. As soon as these magnets are removed from the field, they lose their magnetism. The objects that act as temporary types of magnets are paperclips, iron nails, etc. Temporary magnets are used in telephones, electric motors and even in the production of electricity. There are many other uses of temporary magnets.
3. Electromagnets- Electromagnets are different types of magnets that when you flow current into a tightly wound coil of wire around a nail and then it acts a like a magnet. When the current flows through the coil of wire around the nail (the nail usually has an iron core) it acts like a permanent magnet because of the domain theory. You should research on electromagnetism and the domain theory if you find electromagnetism interesting. These types of magnets and their uses include large cranes, lifting cables and rods during construction, television, computers, radios, video tapes, speakers and many more.