Pen knives, also known as pocket knives, are a type of folding knife that typically has one or more blades that fold into the handle. They have a long history of being used for various purposes, including sharpening things, but their primary function is not specifically for sharpening.

The term "pen knife" actually originated from the idea that these knives were small and compact enough to be carried in a pocket, similar to how a pen would be carried. Pen knives have been used for a wide range of tasks, such as cutting ropes, opening packages, preparing food, carving wood, and many other general utility purposes.

While pen knives may have a sharp blade that can be used for sharpening certain objects, their main purpose is not solely for sharpening. They are versatile tools that can be used for a wide range of tasks, making them popular among outdoors enthusiasts, craftsmen, and everyday users alike. It's important to always use pen knives and any other tools safely and according to their intended purpose.
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