What is horizontal spring oscillation?

Ans: Imagine a mass m is attached to a spring on one end, and the other end is fixed to a wall, and the spring is placed on a smooth surface. When no force is applied to the spring, it remains at its resting position or equilibrium position. However, if the spring is displaced from its mean or equilibrium position outwards and then the force is withdrawn, the spring returns to its resting position in an inward direction. Thus, we can notice that the restoring force always acts in the opposite direction to the displacement. The restoring force also has a proportional relationship with the displacement. Here the spring oscillate in horizontal direction