Here's why:

* Friction is a force that opposes motion between two surfaces in contact. It arises from the microscopic irregularities on the surfaces, which interlock and resist sliding.

* Moving objects will experience friction as they interact with the surfaces they are moving on or with other objects.

Examples:

* A car driving on the road experiences friction between its tires and the asphalt.

* A book sliding across a table encounters friction between its cover and the table's surface.

* Two blocks rubbing against each other experience friction between their surfaces.

Types of friction:

* Static friction: The force that prevents an object from moving when a force is applied.

* Kinetic friction: The force that opposes the motion of an object that is already moving.

Let me know if you'd like more detail about friction!