Speed

* What it is: How fast an object is moving.

* Measurement: Measured in units like miles per hour (mph), kilometers per hour (km/h), or meters per second (m/s).

* Direction: Doesn't care about direction.

* Example: A car traveling at 60 mph. We know how fast it's going, but not which way it's heading.

Velocity

* What it is: How fast an object is moving *and* in what direction.

* Measurement: Measured in the same units as speed (mph, km/h, m/s), but always includes a direction.

* Direction: Crucially important.

* Example: A car traveling at 60 mph north. We know both its speed and the direction of its movement.

In simpler terms:

* Speed: How quickly you're going.

* Velocity: How quickly you're going and where you're going.

Key takeaway: Velocity is speed with a direction.