Maglev levitation, maglev or magnetic suspension is a method by which an object is suspended without other support than magnetic fields. The magnetic force is used to counteract the effects of gravitational acceleration and any other acceleration. The two major problems involved in magnetic levitation are lift forces: providing sufficient upward force to counteract gravity and stability: ensuring that the system does not spontaneously slip or flip over in a configuration where the lift is neutralized. Magnetic levitation is used for magnetic trains, non-contact melting, magnetic bearings and for product display purposes. Magnetic materials and systems may be attracted to or pressed together apart or together with a force dependent on the magnetic field and the area of the magnets. For example, the simplest example of elevation would be a simple dipole magnet located in the magnetic fields of another dipole magnet, oriented with similar poles facing each other, so that the force between magnets repeats the two magnets.