How can two magnets demonstrate magnetic force?

Hint: A magnet is a material or object that produces a magnetic field This magnetic field is responsible for all the properties that magnet has such as attracting various metals and attracts or repels other magnets.The force acts between magnets occurs due to the rules of electromagnetism. Electromagnetism can be defined as it is a process where a magnetic field is created by introducing the current in the conductor.

Complete answer:
In order to how magnetic force occurs between two magnets first we need to know what is magnet
A magnet is a material or object that produces a magnetic field This magnetic field is responsible for all the properties that magnet has such as attracting various metals and attracts or repels other magnets.
So let’s understand what a magnetic field is.
It is a region around a magnetic material or a moving electric charge within which a force of magnetism acts.
Now this magnetic field can be represented by the magnetic field lines.
Now let’s take the example of the bar magnet.

Now as we can see from the figure the magnetic field is emerging from the north pole of the magnet and ending up on a south pole of the magnet.
Now when we put another magnet same as the previous magnet it feels disturbance in magnetic field lines.
And due to this when two opposite poles come in contact it will attract each other and when two same poles come in contact it will repel each other.

Note:
In order to understand the force between magnets first we see the definition of the magnets then we understand the magnetic field and the magnetic field lines which eventually discover how force occurs between the two magnets.