* Friction is the force that opposes motion between two surfaces in contact.

* High friction means the surfaces resist movement significantly.

Let's analyze each material:

* Glass: Glass is relatively smooth and has low friction. Think of how easily a glass slide allows movement.

* Ice: Ice is surprisingly slippery and has very low friction.

* Oil: Oil is designed to reduce friction, making it a lubricant.

* Rubber: Rubber has high friction. This is why we use rubber tires on cars (for grip) and rubber soles on shoes (for traction).

Therefore, rubber is the material with the highest friction among the options provided.