A fixed blade is a knife in which the blade does not fold and extends most of the way into the handle. This type of knife is typically stronger and larger than a folding knife. Activities that require a strong blade, such as hunting or fighting, typically rely on a fixed blade. Some famous fixed blade designs include the Ka-bar and Bowie knives.
The classic bird and trout knife is a straight, sheathed knife measuring between 6 and 7 inches in overall length with a 3 to 3 1/2 inch blade. The blades can be any of several different shapes. These small knives were usually made to be worn on the belt and used for field dressing fish and/or birds.
Drop point is a knife blade that slopes on the spine of the blade from the handle of the knife to the tip of the blade. This allows the spine of the blade (where the blade is thicker, and thus stronger) to continue forward to the tip of the blade. The curve on the top of a drop-point blade is always convex, which is what distinguishes it from a clip point blade.