Here's why:

* Elasticity: Rubber is an elastic material, meaning it can deform under stress and return to its original shape when the stress is removed.

* Force: When you stretch a rubber band, you apply a force to it. This force causes the rubber band to deform and store energy.

* Elastic Force: As the rubber band is stretched, it exerts an equal and opposite force back on you. This force is called elastic force. It is a restoring force that tries to bring the rubber band back to its original shape.

Key Properties of Elastic Force:

* Directly proportional to displacement: The more you stretch the rubber band, the stronger the elastic force becomes.

* Acts in the opposite direction of the applied force: It tries to return the rubber band to its original state.

* Depends on the material's properties: The stiffness of the rubber band determines how much force it exerts for a given amount of stretch.

Let me know if you'd like to explore any of these properties in more detail!