Pocketknife

A small knife whose blade or blades fold into the handle for safe, portable carrying. Many pocketknives include additional tools such as scissors, screwdrivers, or can openers.

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Knife lock: A mechanism that holds a folding knife blade open during use. Locks reduce the risk of the blade folding onto the user's hand.
Knife blade: The sharpened cutting part of a knife, attached to or formed with its handle. A pocketknife's folding blade is its defining working part.
Swiss Army knife: A Victorinox-made pocketknife known for combining a main blade with multiple folding tools. It is a prominent multitool-style pocketknife with a wide range of implements.
Fixed-blade knife: A knife whose blade is permanently fixed to its handle rather than folding into it. It avoids a folding joint but is generally less compact to carry.
Folding knife: A knife with a blade that pivots into its handle for storage. Pocketknives belong to a design tradition that predates the modern pocketknife.
Slipjoint: A folding-knife mechanism that uses spring pressure to resist blade closure without locking it open. Many traditional pocketknives use this nonlocking mechanism.
Knife handle: The part of a knife designed to be held, often enclosing or supporting its blade. The handle houses the folded blade and provides a grip when it is open.
Multitool: A compact tool that combines several functions, often around folding pliers or a knife. Many pocketknives expand into multitools by adding implements beyond blades.
Switchblade: A folding knife whose blade opens automatically when a release mechanism is activated. Its automatic opening distinguishes it from manually opened pocketknives.
Roman folding knife: An ancient folding knife associated with Roman-era metalwork and portable use. It illustrates that folding knives existed long before modern pocket tools.