The combination of how fast you move and in what direction is called velocity.

Here's why:

* Speed tells you how fast something is moving, but not where it's going.

* Direction tells you which way something is moving, but not how fast.

Velocity combines both speed and direction. It's a vector quantity, meaning it has both magnitude (speed) and direction.

For example, you could say:

* "The car is traveling at 60 miles per hour." (This is speed only)

* "The car is traveling north." (This is direction only)

* "The car is traveling at 60 miles per hour north." (This is velocity)