Velocity describes both the speed and direction of an object, and can change due to changes in speed or direction, such as a car rounding a curve. Acceleration is the rate of change of velocity, and can occur through changes in speed or direction - positive acceleration occurs when acceleration is in the same direction as velocity, causing an increase in speed, while negative acceleration or deceleration occurs when acceleration is in the opposite direction of velocity, causing a decrease in speed. Acceleration depends on both the change in velocity over time - the time interval is the period over which the change in velocity took place.
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