When the south poles of two magnets are almost touching, the force between them is repulsive.

Here's why:

* Like poles repel: Magnets have two poles, a north pole and a south pole. Like poles (north-north or south-south) always repel each other.

* Opposite poles attract: Unlike poles (north-south) always attract each other.

Therefore, when two south poles are brought close together, they will push away from each other due to the repulsive force.