"The distance covered by a body in a unit time in a particular direction is called velocity.”
Formula
Velocity = Displacement/Time
or V = S/t,SI unit of velocity is metre per second
In Detail:
The velocity of an object is the rate of change of its position with respect to a frames of reference and is a function of time. Velocity is equivalent to a specification of its speed and direction of motion (e.g. 60 km/hr to the north). Velocity is a physical vector quantity;means both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called "speed"(only 60km/hr no direction for speed).