Here's why:

* Magnitude: Velocity tells us how fast something is moving (speed).

* Direction: Velocity also tells us the direction of motion.

For example, saying "the car is traveling at 60 mph" only tells us the speed. To describe the velocity, we need to add the direction, such as "the car is traveling at 60 mph eastward".

Key difference:

* Scalar: Quantities that have only magnitude (e.g., speed, mass, temperature).

* Vector: Quantities that have both magnitude and direction (e.g., velocity, displacement, force).