Difference in ithe intial and the final position.......... for ex.. if umove in a circle your final position and initial position is the same... so the displacement is zero as it is a diff. between them.......
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Displacement is defined as the Shortest distance between two points .
The shortest distance b/w the initial point and final point is called displacement....mArk as best.......

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Displacement is the length of straight line path that can be drawn from the initial starting point and to the final point that is  shortest distance between the two points 
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Displacement is the Shortest distance between two points .