Each magnet has a North-seeking Pole and a South-seeking Pole (North pole of a magnet points toward the Earth’s North Pole and vice versa). Opposites attract, so when North and South meet, they attract eachother and stick. When North and North or South and South come together, they repel eachother.
Because they have molecules that are arranged in a manner (they are all more or less lined up in one direction or another) that gives them an electromagnetic field (because the atoms themselves are polarized). When two electromagnetic fields are pushing (colliding—or occupying the same region of space) they exert a force upon one another, thus the magnets are pushed apart. It has mainly to do with the arrangement of the atoms in the magnetic substance (the magnet itself).
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