Here's why:

* Speed tells us how fast an object is moving.

* Direction tells us which way the object is moving.

Velocity combines both of these elements into a single measurement. It's a vector quantity, meaning it has both magnitude (speed) and direction.

Example:

* A car traveling at 60 miles per hour east has a velocity of 60 mph east.

* A bird flying at 15 meters per second south has a velocity of 15 m/s south.

Let me know if you'd like more information about velocity!