Magnetic fields are vector fields that describe the magnetic force exerted on moving charges, electric currents, or magnetic materials. They are created by magnetic dipoles or combinations of dipoles. A magnetic dipole has both north and south polarity.
Magnetic field lines allow us to visualize the magnetic field around a magnetic dipole/object. They point from the north pole to the south pole, and will always form a closed loop through a dipole. While magnetic field lines point from north to south outside the magnet, they point from south to north inside the magnet.
Magnetic dipoles are created by the rotational and circular motion of electric charge carriers (electrons?). When electrics spin (up or down), they create a magnetic field.
