Distance and displacement are two quantities that may seem to mean the same thing yet have distinctly different definitions and meanings.
scalar quantity that refers to "how much ground an object has covered" during its motion.
Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.
To test your understanding of this distinction, consider the motion depicted in the diagram below. A physics teacherwalks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North.