That's a great question! Here's the breakdown:

* Speed is how fast something is moving. It only tells you the magnitude (how much). For example, 60 miles per hour.

* Velocity is speed in a specific direction. It tells you both the magnitude and the direction. For example, 60 miles per hour north.

So, yes, speed is the magnitude of velocity. Velocity is a more complete description of motion because it tells you both how fast something is moving and where it's going.