Imagine you have two magnets. One is a big, strong magnet and the other is a small, weak magnet. When you bring them close together, the big magnet pulls the small magnet towards it. This is a force that is created by the magnets.
Ampère's Force Law is kind of like the force created by magnets, but it is a force created between two wires that have electricity running through them. The electricity running through the wires creates a magnetic field, which is kind of like an invisible force field around the wire.
When you have two wires near each other and electricity is flowing through both of them, the magnetic fields from both wires interact with each other and create a force between the wires. This force is stronger if the wires are closer together and if there is more electricity flowing through the wires.
So basically, Ampère's Force Law is a way to understand how two wires with electricity flowing through them interact with each other and create a force.