A **pocket knife** is a compact, foldable tool designed for versatility and everyday carry. It features one or more blades that pivot into the handle, allowing it to fit safely and comfortably in a pocket or pouch. Modern designs often include a **locking mechanism** to prevent accidental closure during use and a **thumb stud** or flipper for easy one-handed opening. Beyond simple cutting tasks, these knives are essential tools for outdoor survival, utility work, and general problem-solving, with handle materials ranging from durable synthetics like G10 to classic wood or bone.