Sharpening

Sharpening is the process of creating or refining a sharp edge of appropriate shape on a tool or implement designed for cutting. Sharpening is done by removing material from the implement with an abrasive substance harder than the material of the implement, followed sometimes by processes to polish the sharp surface to increase smoothness and correct small mechanical deformations without removing significant metal. The process creates a bevel - the angled surface that meets at the cutting edge.

Ideally, the two sides of the edge meet at a precise mathematical point, though in practice, a microscopic radius always remains.
Sharpening is distinct from honing or steeling, which are maintenance steps used to realign an edge that has rolled over during use, though the terms are often used interchangeably in casual conversation.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0