More specifically, it's the magnetic force, which is a fundamental force of nature. Here's a breakdown:

* Magnetic poles: Magnets have two poles, a north pole and a south pole.

* Attraction and Repulsion: Opposite poles (north and south) attract each other, while like poles (north and north, or south and south) repel each other.

* Magnetic field: Magnets create an invisible area of influence around them called a magnetic field. This field is what exerts the magnetic force on other magnets and magnetic materials.

So, the force that pulls magnets together is actually the interaction of their magnetic fields, specifically the attraction between opposite poles.