The quantity that gives both the speed and direction of an object is called velocity.

Here's why:

* Speed is a scalar quantity, meaning it only tells you how fast something is moving. For example, "50 miles per hour."

* Direction is also a scalar quantity, indicating which way something is moving. For example, "north."

* Velocity is a vector quantity, meaning it combines both magnitude (speed) and direction. For example, "50 miles per hour north."

So, velocity gives you a complete picture of an object's motion.