Knife

A knife is a hand tool with a sharp blade and a handle, used to cut, slice, or pierce materials.

Cutting: Cutting is the separation of material by applying force along a narrow line or edge. A knife concentrates force at its edge to separate material.
Blade: A blade is the flat or curved cutting part of a tool or weapon. The blade carries the edge and determines the knife's cutting reach.
Chef's knife: A chef's knife is a broad, versatile kitchen knife used for chopping, slicing, and mincing. Its curved edge supports a rocking motion across a cutting board.
Oldowan: The Oldowan is an early archaeological stone-tool industry characterized by simple chipped flakes and cores. Oldowan flakes are among the earliest known sharp-edged tools used for cutting.
Scissors: Scissors are a hand-operated cutting tool made of two pivoted blades. Unlike a knife, scissors cut through opposing blades rather than a single edge against a surface.
Knife edge: A knife edge is the thin, sharpened region of a blade that performs cutting. Its geometry governs how readily the blade enters and parts material.
Handle: A handle is the part of a tool designed to be held or gripped. The handle transfers hand force to the blade and shapes control.
Paring knife: A paring knife is a small kitchen knife used for precise, close-up cutting. Its short blade gives fine control for peeling and trimming.
Acheulean: The Acheulean is an archaeological stone-tool industry known for bifacial handaxes and related tools. Its shaped stone tools show increasingly deliberate control of cutting edges.
Saw: A saw is a tool with a toothed blade used mainly for cutting through material by repeated strokes. Its teeth remove material in a kerf, unlike a knife's continuous edge.

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