Here's why:

* Speed tells you how fast something is moving.

* Velocity tells you how fast something is moving and *in what direction*.

Think of it like this:

* Speed: A car is traveling at 60 miles per hour.

* Velocity: A car is traveling at 60 miles per hour *north*.

Key points about velocity:

* It's a vector quantity: This means it has both magnitude (speed) and direction.

* It can be positive or negative: A positive velocity indicates movement in one direction, while a negative velocity indicates movement in the opposite direction.

* It can change even if speed stays constant: If a car turns a corner while maintaining its speed, its velocity changes because its direction changes.

Unit of Measurement:

Velocity is typically measured in units like:

* Meters per second (m/s)

* Kilometers per hour (km/h)

* Miles per hour (mph)

Let me know if you have any other questions!