Vee Bottom 
The "V"-bottom boat is probably the most common hull design. Most manufacturers of boats use a variation of this fundamental design. It offers a good ride in rough water because the pointed bow cuts through the water and the "V"-shaped bottom softens the up-and-down movement. The degree of the angle of the "V" is called the deadrise. A deep vee is generally consider one that has 16 degrees or more of deadrise. As the "V" shape extends to the back of the boat, it sometimes flattens out until it all but disappears at the transom. These flat surfaces at the very bottom are called a "pad." This pad allows for a little more planing surface at top speed at the sacrifice of ride smoothness, but increases top speed. Setup  Wetted area footprint of a typical mono and stepped mono hull. When setup correctly the CG of the boat should be 25-30% back from the transom producing this footprint when at full speed.
 Turn Lift, this is an effect of water pushing on the rudder during a turn and lifting the boats stern. When a vee bottom boat turns it does not do it flat but instead tends to lean over on its side. When this happens it presents the rudder face at an angle that can produce lift and make the stern end of the boat bounce op on the water surface.
 To help compensate the turn lift and resulting inefficiently we add turn fins. These are placed perpendicular to the Vee bottom so that when the boat lays on its side during a turn the fin will be perpendicular with the water surface and not generate any lift.
 In this picture of my oval master you can see the turn fins and the rudder. I've banked the boat so you can see how it would look during a turn. You can imagine how the water flow would want to lift the rudder out of the water. Again the turn fins help hold the boat down plus give something to push against to help improve turning.
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