1. Properties of magnets: Magnets have magnetism and can attract iron objects.

2. Magnets have magnetic poles, and every magnet manufacturer produces magnets with two types of magnetic poles: N-pole and S-pole, which exist in pairs.

3. Temporary magnet and permanent magnet: When ferromagnetic materials are magnetized and easily lose their magnetic properties, they are called temporary magnets (such as iron); When ferromagnetic materials are magnetized and do not easily lose their magnetic properties, they are called permanent magnets (such as steel).

4. The magnet manufacturer believes that when two magnets are close to each other, the same magnetic poles will repel each other and push apart, while different magnetic poles will attract and stick to each other. So it is said that the same poles repel each other, and the opposite poles attract each other.