A binder clip is a simple device for binding sheets of paper together. It leaves the paper intact and can be removed quickly and easily, unlike the staple.
Binder clip.
The handles can be folded down once the clip has been attached, and can also be removed for a semi-permanent binding.
An assortment of binder clips, with an AA battery for scale
Clip with golden loops
A paper clip is a tool used to hold sheets of paper together, usually made of steel wire bent to a looped shape. Most paper clips are variations of the Gem type introduced in the 1890s or earlier, characterized by the one and a half loops made by the wire. Common to paper clips proper is their utilization of torsion and elasticity in the wire, and friction between wire and paper. When a moderate number of sheets are inserted between the two "tongues" of the clip, the tongues will be forced apart and cause torsion in the bend of the wire to grip the sheets together. They are usually used to bind papers together for productivity and portability.
A few paper clips of different colors coated in a mix of plastic and rubber
Paper clip holder
Small metal paper clip, with measure in centimetres
Assorted paperclip shapes, sizes, and designs
