Here's why:

* Frame of reference: A frame of reference is a coordinate system used to describe the motion of an object. It's essentially a perspective from which you observe something.

* Direction: The direction of an object's motion is defined relative to the chosen frame of reference. For example, a car traveling north is moving in that direction *relative to the ground*. If you were standing on the car, the car would appear stationary, and the ground would be moving south.

* Velocity: Velocity is a combination of both speed and direction. Just like direction, velocity is also relative to the chosen frame of reference. A car traveling at 60 mph north has a different velocity than a car traveling at 60 mph south, even though they have the same speed.

Example:

Imagine you're on a train traveling at 60 mph.

* Relative to the train: You are stationary.

* Relative to the ground: You are moving at 60 mph.

This highlights how direction and velocity are not absolute but rather depend on the chosen frame of reference.