You run a 400 m track. At the end of your run, what is your displacement?

Please mention that the path is circular or he/she take four laps if he takes:-

Displacement is a vector quantity that measures the distance between the starting point and ending point, not taking the actual path traveled into account. At the end of four laps, the athlete will be back at the starting line for the track, so the athletes total displacement will be zero.