Magnets exert forces on one another; similarly to electric charges, like poles will repel each other and unlike poles will attract. There is one big difference between magnets and electric charges, though - magnetic poles always exist in north-south pairs! If you take a magnet and cut it in half, you don't wind up with just a north pole and just a south pole; you wind up with two smaller magnets, each with its own north and south poles. An isolated magnetic pole is called a magnetic monopole; it has been theorized that such things might exist in the form of tiny particles similar to electrons or protons, but no such particles have ever been found.
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