Answer:
Distance is the total length travelled, or in other words, it is a measure of how far apart two objects are.
Displacement, on the other hand, the difference between the starting and and ending positions of an object.
For example, if a person walks 10m forwards, then 7m backwards, thereby ending up where he started, he will have travelled a distance of
10 + 7 = 17m .
But the difference between his starting and finishing positions is
10 - 7 = 3m.
If, however, the man walked 10m forwards and then 10m backwards, the distance he covered would be 10 + 10 = 20m, but the displacement would've been 0 as there would be no difference between his starting and ending positions.
Let me know if you still don't understand.