What is the principle of magnetic curtains? Can you elaborate on it?

The principle of magnetic curtain is to attract iron, cobalt, nickel and other substances. The regions with strong magnetism at both ends of the magnet are called magnetic poles, one end is called North Pole (N Pole) and the other end is called South Pole (S Pole). Magnetic poles of the same name repel each other, but magnetic poles of different names attract each other. The magnetic curtain drives the curtain to move back and forth along the track through the magnetic field,