Velocity and speed are related but distinct concepts when it comes to waves:

* Speed: This refers to how fast a wave travels through a medium. It's a scalar quantity, meaning it only has magnitude (e.g., 10 meters per second).

* Velocity: This includes both the speed of the wave *and* its direction. It's a vector quantity, meaning it has both magnitude and direction (e.g., 10 meters per second to the east).

So, while the speed of a wave is a component of its velocity, they're not the same thing.

Think of it this way: Imagine a wave traveling across the surface of a lake. The speed tells us how quickly the wave crests move across the water, while the velocity tells us both the speed and the direction (like northeast).