Average Speed and Average Velocity are both similar, in that, both terms refer to the change in position of a body. However, there are still some differences between them. Average speed can be defined as the total distance covered by an object divided by the total time taken when an object moves from point A to point B. The average speed of such an object is calculated by dividing the total distance between point A and A by the total time is taken by the object to cover the distance.
Speed is a scalar quantity because it talks only about the magnitude and not the direction. Average velocity, on the other hand, is the total displacement of an object divided by the total time taken by the object. Displacement is not only talking about the total distance covered by an object, but also the initial position of an object and the final position. Velocity is a vector quantity because it has both magnitude and direction.