What is the difference between distance and displacement?

Distance is the scalar value of how far an object has traveled regardless of direction. Distance refers to "how much ground an object has covered" during its motion.
Displacement is the vector value of how far an object has been displaced, meaning how far is it from where it started.Displacement refers to "how far out of place an object is".

They are similar but not the same. For example, if you walked in a circle and stopped in the same exact place you started, the distance you traveled would be whatever the circumference of the circle you walked was; your displacement would be zero!