Velocity is a measure of how fast something moves in a particular direction. In otherwords, a velocity is a speed with a direction. For instance, if an object moves east at 9 metres per second (9m/s), we would say that its velocity is 9 m/s to the east
It is a vector quantity.Vector quantity is what which has both magnitude and direction
For example, "5 metres per second" is a scalar, whereas "5 metres per second east" is a vector