The history of pocket knives can be traced back to the early Iron Age.  However, they were quite rare in earlier days and did not become more common until modern times.  Today , pocket knives are enormously popular. They come in a wide variety of sizes and blade lengths. Pocket knives fold up, can have one blade or many blades, fit in your pocket, and their versatility is almost endless. The handles of pocket knives can be plain and simple, or so embellished as to be considered works of art.  Pocket knives can be beautiful, as well as functional tools.