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When there are moving electrons, there is a magnetic field. No moving electrons = no magnetic field.

We can make an electromagnet by passing an electric current (= moving electrons) through a wire coil. And that field may be strengthened further by placing a soft iron core inside the coil.

There are also permanent magnets, with which you're already familiar - a compass, a fridge magnet and so on. These are materials in which the electrons have aligned themselves so their spins are parallel. (More moving electrons - even if they are just spinning).

The commonest members of this group are iron and nickel materials, though a dozen or so materials may aid the strength of the magnet.

Electromagnetic machines are such things as electric generators and motors, relays and solenoids.

The Earth has a magnetic field, generated we believe by electric currents flowing in the mantle, roughly parallel to the Equator.

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