Displacement covered by a body in unit time is called *speed*.

Velocity is a bit more specific. It is the rate of change of displacement with respect to time, and it includes both magnitude (speed) and direction.

Here's a breakdown:

* Speed: How fast an object is moving (e.g., 50 km/h).

* Velocity: How fast an object is moving *and* in what direction (e.g., 50 km/h north).

Example:

Imagine two cars traveling at 60 km/h. One is traveling east, and the other is traveling west. Both have the same *speed*, but they have different *velocities* because they are moving in opposite directions.