1. Change in speed: This means the object is moving faster or slower. For example, a car accelerating from a stop sign is increasing its speed, and a car braking to a stop is decreasing its speed.

2. Change in direction: This means the object is changing the direction it's moving, even if it's maintaining the same speed. For example, a car turning a corner is changing its direction, and a ball thrown in a parabolic arc is changing its direction continuously.

It's important to note that velocity is a vector quantity, meaning it has both magnitude (speed) and direction. Therefore, a change in either speed or direction will result in a change in velocity.