Velocity is a vector quantity referring to the rate at which an object changes its position.
Velocity is a vector quantity referring to the rate at which an object changes its position. Something that is oscillating back and forth might be described as having zero velocity. Even though it is in motion, it is not (on average) changing position.
If a person were to walk two steps forward and take one step back every 10 seconds, and repeat this process, their velocity could be described as one step forward per 10 seconds. Because velocity is a vector, the direction is important. "Forward" in the previous example is the direction, but could be applied to terms such as "voltage increase" or "traveling east."