The speed of a moving object taken together with its direction of travel gives the object its velocity.

Here's why:

* Speed is a scalar quantity, meaning it only has magnitude (how fast something is moving).

* Direction adds the element of vector information.

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

For example:

* A car traveling at 60 mph has a speed of 60 mph.

* A car traveling at 60 mph north has a velocity of 60 mph north.