Velocity tells you both the speed and direction of an object's motion. Speed only tells you how fast an object is moving.

Here's an example:

* Speed: A car is traveling at 60 mph.

* Velocity: A car is traveling at 60 mph north.

In this case, both the car's speed and velocity are the same (60 mph), but the velocity also includes the direction of travel (north).

Here are some key differences between speed and velocity:

* Speed is a scalar quantity, meaning it only has magnitude (amount).

* Velocity is a vector quantity, meaning it has both magnitude and direction.

* Speed can be constant even if velocity is changing. For example, a car traveling in a circle at a constant speed still has a changing velocity because its direction is constantly changing.

In summary, velocity is a more complete description of motion than speed because it includes both the rate of movement and the direction of movement.