Relative velocity is the velocity of one object as observed from another object. It helps us understand how fast one object is moving compared to another, rather than just its speed in relation to a fixed point, like the ground. For example, if a car is moving at 60 km/h and another car is moving at 40 km/h in the same direction, the relative velocity of the first car to the second is 20 km/h. This concept is important in physics and engineering, as it allows for the analysis of motion in different frames of reference. When calculating relative velocity, the direction of movement is also crucial. For instance, if two objects are moving towards each other, their relative velocity is the sum of their speeds. Understanding relative velocity is essential for applications in automotive design, aircraft navigation, and sports science.