**Explanation:**

Magnetism is a property of certain materials that can attract or repel other materials. It is caused by the motion of electrons around the nucleus of an atom.

**Motion of Electrons:**

When an electron moves, it creates a magnetic field. In most materials, the electrons are constantly in motion due to their thermal energy. However, in materials that exhibit magnetism, the motion of the electrons is aligned in a particular direction, resulting in a stronger magnetic field.

**Alignment of Electron Spins:**

One of the key factors in determining whether a material is magnetic is the alignment of the spins of its electrons. Each electron has a property called "spin," which is a fundamental property similar to the rotation of a planet on its axis. The spin of an electron can be either "up" or "down," representing two opposite directions.

In non-magnetic materials, the spins of the electrons are randomly oriented, canceling out each other's magnetic fields. But in magnetic materials, such as iron or nickel, the spins of the electrons are aligned in the same direction, creating a net magnetic field. This alignment can occur due to various factors, including the arrangement of atoms in the material's crystal structure.

**Magnetic Domains:**

In magnetic materials, the alignment of electron spins occurs in small regions called magnetic domains. Each domain acts like a tiny magnet, with its own north and south poles. In an unmagnetized material, the magnetic domains are randomly oriented, resulting in a net magnetic field of zero. However, when an external magnetic field is applied to the material, the domains align with the field, creating a stronger overall magnetic field.

**Interaction of Magnetic Materials:**

When two magnetic materials come into contact, their magnetic fields interact with each other. If the magnetic fields are aligned in the same direction, the materials are attracted to each other. If the magnetic fields are aligned in opposite directions, the materials repel each other.

**Conclusion:**

In summary, magnetism in materials is due to the motion of electrons around the nucleus. The alignment of electron spins in magnetic materials creates a net magnetic field, which can attract or repel other materials. Understanding the behavior of magnetism is important in various fields, including physics, engineering, and everyday applications such as magnets and compasses.