-Tanto: This style is very good at penetration, stabbing, etc. The tip is able to withstand pretty fierce usage and has been reported to be capable of punching through some soft body armor.
-Clip Point: This is the style seen on the traditional Ka-Bar that set the standard for combat knives. The tip is great for piercing, and the rounded edge is great for slicing
-Drop Point: This style is one of the most common, and the tip has a strong reinforcement, though the blade is not good for much more than slicing due to the thick back all the way to the tip, unlike the clip point.