A dagger is a sharp knife. 
A dagger is a sharp knife. 

A dagger is a fighting knife. It has a very sharp point. Most daggers are made for stabbing or thrusting. 
People have used daggers for a long time. In the old days, they were made of bone or flint. Later, people used copper and bronze. 
In the Middle Ages, daggers became very popular again. Knights used them for defense. 
A dagger is a special kind of fighting knife. It is built to have a very sharp point. This point makes it good for stabbing or thrusting. 
How a dagger works depends on its specific shape. Some daggers are made to cut along their edges. Others are made only for thrusting through a target. 
People have used daggers throughout all of human history. In the Neolithic times, the very first daggers were made from bone, ivory, or flint. 

Different cultures created many unique types of daggers. In ancient Iberia, makers produced high-quality iron daggers with triangular blades. 

It is helpful to think of a dagger as a tool for close-up work. While a sword is a long weapon, a dagger is meant for very close combat.
A dagger is a specialized type of fighting knife designed for close-proximity combat. 
The mechanism of a dagger relies on its ability to pierce or cut. A thrusting dagger focuses energy on a single, sharp point to penetrate a target. Some designs, like the Renaissance stiletto, may have no cutting edge at all. This makes them purely thrusting weapons. Other types, such as the European rondel dagger or the Afghan pesh-kabz, feature single cutting edges.
Daggers vary significantly in their specific parts and types. A combat knife is a specific sub-type designed strictly for military use. For example, the U.S. Army M3 trench knife is both a combat knife and a fighting knife. 
Humanity has used daggers since antiquity, though their materials have changed over time. In Neolithic times, the earliest daggers were made of flint, ivory, or bone. During the early Bronze Age in the 3rd millennium BC, copper daggers appeared. In ancient Egypt, daggers were usually copper or bronze. However, royalty possessed ornate gold weapons. One famous iron dagger was found in the tomb of Tutankhamun. Researchers used x-ray fluorescence spectrometry in 2016 to study it. They found it contained 10% nickel and 0.6% cobalt. This composition suggests the iron came from a meteorite.
Historical importance is often seen in how different cultures adopted these weapons. In Iberia, artisans produced high-quality iron daggers with triangular blades between the 5th and 3rd centuries BC. 

Legal definitions of daggers can be quite broad and vary by jurisdiction. In Missouri, the Supreme Court used a dictionary definition to rule that a pointed knife with a four- to five-inch blade is a dagger. 
Understanding daggers requires looking at their connection to broader military and social systems. They are not just tools; they are reflections of technological progress. The shift from flint to smelted iron shows the evolution of human metallurgy.
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