Drop Point is a pattern used on many knives, commonly seen on hunting blades. The tip is lowered (dropped) via a convex arc from the spine to allow the tip to be ground thicker. This convex shape differentiates it from the clip point.
Clip Point is a great all-around format and one of the most popular, used on most bowie knives. The blade shape uses a concave or straight cutout toward the tip.
Sheepsfoot blades really can't be said to have a point, because the spine curves down to meet with the straight edge. They can be safely used as a rescue knife or in situations that don't require a point.
Spear Point is a symmetrical grind with the tip located at the blade's center. Double-edged, the spear point shape makes for a great dagger.
Dagger is the format designed to maximize piercing. The dagger usually features two sharp edges to reduce the profile and let the knife cut on both sides. It is also symmetrical but can vary to a finer edge than the spear point.
Tanto has become identifiable for its angular shape, using two straight edges that are joined. The Tanto tip is very strong due to the spine keeping its full width until it nears the tip, which then tapers to create the point.