Understanding Domain Structure in Ferromagnetic Substances

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Homework Statement

Dear Members,
Diamagnetic substances acquire magnetism due to orbital motion of electrons
paramagnetic substances acquire magnetism due to interaction between magnetic dipoles
Ferromagnetic substances acquire magnetism due to domain structure.
This is what my textbook says. I don't understand the concept domain structure. Please help the concept of domain structure and how it helps ferromagnetic substances acquire magnetism. Thanks in advance, revered members.

Homework Equations

The Attempt at a Solution

 

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In ferromagnetic materials, there are "domains" of similarly oriented magnetic fields. Think of it like a jigsaw puzzle, where each piece has one magnetic moment which points in one direction. The overall sum of these fields may not be 0, and that is why these materials can have a magnetic field.