A knife is a sharp-edged tool. It has different forms according to its function, the job, or hobby used in its performance.

The cutting or blade-like part of many devices is also called a knife. For example, plow blade, razor blade, harvester blade, turbine blade.

The barrel is the most basic and cutting function of knives and swords. The barrel is mainly made of steel.

Flintstone, obsidian, and bone were first used in barrel construction in the stone age. The use of metal in the production of knives began with copper and bronze, which gave its name to the following historical periods. After its discovery, iron replaced these other materials. Of course, throughout history, instead of "iron," knives, etc. "Steel" would be a more technically correct term to describe the material used to make tools. In recent years, materials such as titanium and ceramics, which are offered to us thanks to the technology of the age, have also found particular uses as barrel raw materials.

The muzzle is the part of the barrel that is sharpened. A knife can be single or double-bladed.

The ridge is the other blunt line on the muzzle opposite the rim in a single-bladed blade.

The handle is the part that allows the knife to be held in the hand while using it. Many knives can only consist of the barrel and handle. Unlike knives, the sword hilt is used instead of the word handle for swords.

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