You're right to be confused! There's only one concept called speed, and it's closely related to velocity. Here's the breakdown:

* Speed is a scalar quantity. This means it only tells us how fast something is moving. It's simply the magnitude of the motion. For example, a car traveling at 60 mph has a speed of 60 mph.

* Velocity is a vector quantity. This means it tells us both how fast something is moving *and* in what direction. It's the speed with a direction attached. For example, a car traveling at 60 mph eastward has a velocity of 60 mph east.

In summary:

* Speed: How fast something is moving.

* Velocity: How fast something is moving *and* in what direction.

Let me know if you have any other questions!