A plain piece of iron contains many domains, but their spins point in different directions. Because their effects balance out, the metal shows no magnetism to the outside world. When the metal is brought near a strong magnet, something remarkable happens: the magnetic field of the external magnet influences the domains inside the iron, causing many of them to rotate and align. The more domains that share the same direction, the stronger the emerging magnet becomes.

Once the domains are aligned, the piece of metal develops two poles. The end where most spins point outward becomes the north pole, and the end where they seem to converge becomes the south pole. These poles are not special physical spots built into the metal; they are simply the natural ends of one large, combined direction created by the electrons inside. A magnet is a magnet because of collaboration — countless electrons agreeing on a single direction.

Electricity can produce the same effect. When an electric current flows through a coil of wire, it generates a magnetic field that temporarily aligns the domains inside a metal core. This is the principle behind electromagnets, which can lift heavy objects or operate machinery. Whether created by a permanent magnet or by an electric current, magnetism always comes from organized electron spins.