A Magnet attracts or repels other Magnets, depending on their mutual orientation of North and South Poles. When placing like Poles of two Magnets together, the Magnets repel each other, However, if opposite Poles are placed together, they attract each other. A permanent magnet is an object that produces a magnetic field around itself. It is this field that enables them to stick to each other and to some types of metal. Specifically, they stick to ferromagnetic materials like iron and things that contain iron, such as steel.
They can't because like poles repel like North and North; South and South
