I have seen an example here where he compares atomic nuclei to the sun, and electrons outside the nucleus to planets orbiting the sun (but it should be noted that electrons outside the nucleus move irregularly), so the spin of electrons is like the rotation of the earth, and the orbital motion of electrons is like the revolution of the earth.

Both the "rotation" and "revolution" of electrons generate magnetic moments (a physical property of magnets), where the spin generated is called spin magnetic moment, and the motion around the nucleus produces orbital magnetic moment.

A magnetic moment is a vector with a direction, and the direction of the magnetic moment of a magnet points from its guide pole to the north pole, depending on its magnetism and magnitude.

Although electrons are all the same, and the magnetic moment of electrons should also be the same, differences in the magnetic properties of substances can be caused by the different types and even the arrangement order of atoms and molecules. In academia, we roughly classify substances into three categories based on their magnetic characteristics: paramagnetic, diamagnetic, and ferromagnetic, collectively known as magnetic media.