Here's why:

* Displacement is the change in position of an object. It's a vector quantity, meaning it has both magnitude (size) and direction.

* Distance is the total length of the path traveled. It's a scalar quantity, meaning it only has magnitude.

Example: Imagine a runner completing a lap on a circular track.

* Distance: The runner covers a significant distance as they run around the track.

* Displacement: The runner's final position is the same as their initial position. Since there is no overall change in position, their displacement is zero.

Key Point: A body can move for a significant amount of time and distance, but still have a displacement of zero if it ends up back where it started.