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A magnet is material that produces a magnetic field. Because of this field, magnets can both attract and repel each other (depending on which end of the magnet you use) and can attract ferromagnetic materials, such as iron. The small pieces of iron filing on the magnet in the picture follow the shape of the magnet's magnetic field.
Magnets are most often seen stuck to refrigerators.
Magnets are most often seen stuck to refrigerators.