Harrow (tool)
A harrow is a farm tool.  It is an implement for breaking up and smoothing out the surface of the soil. In this way it is different from a plow, which cuts deeper into the soil. A plow also lifts up the soil and tips it over, but a harrow works mostly by cutting into the soil and breaking it up. Harrowing is often carried out on fields to follow the rough surface left by plowing.