It is just that simple and you just eliminated acres and acres of fishless water. A drop is that last contour on a piece of structure that has the steepest incline into the deepest water in the area. Keep in mind that deep is relative, what is deep in one lake might be quite shallow in another. In Caddo Lake for example, where the average depth is seven or eight feet, a two foot change in bottom contour is significant. In a lake like Table Rock or mead, deep may be fifty, sixty or even seventy feet deep.
Drops occur in many different forms.
These drops are sometimes referred to as breaks, but by whatever name you choose to call them, understanding how fish relate to bottom structure is the key to finding fish when they are in their sanctuary areas of deeper water. Buck Perry, taught us that fish live and spend most of their lives in deeper water. But at times there are movements of fish from deeper water shallow water. It is while the fish are shallow and accessible that they are said to be biting. A lot of factors like weather, moon phase, water condition and seasonal changes dictate the frequency and duration of these movements.