What is the quantity which is measured by the area occupied below the velocity-time graph?

Velocity-time graph:
The area under a velocity-time graph serves as a representation of the displacement.The displacement of an object moving at a constant velocity is equal to the product of velocity and time, i.e. $S=Vt$, where $S$ is the displacement, $V$ is the velocity and $t$ is time.When velocity is negative, the area under the curve would also be negative.