A magnetic field is a non contact force that Repels (Pushes) or Attracts (Pull's) iron rather a Ferromagnetic metal

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Magnetic field​

The earths magnetic field​

​the Earth's magnetic field is powered by the solidification of the planet's liquid iron core. The cooling and crystallization of the core stirs up the surrounding liquid iron, creating powerful electric currents that generate a magnetic field

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​Electromagnets

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the​ center of the coil

​Fun fact

​The more coils wound on the iron the more powerful the electromagnet is.