What is a stapler?

a device for fastening together sheets of paper with a staple or staples.

It is one of those small metal tools with a plastic handle.

You use it to join two pieces of paper.

A stapler is a mechanical device that joins sheets of paper or similar material by driving a thin metal staple through the sheets and folding the ends. 

Staplers are widely used in government, business, offices, homes and schools.

a small device that you can hold in your hand or use on a table to push staples through pieces of paper

A device used to bind material together by means of staples.

a machine for fastening materials together with wire staples.

a machine that inserts staples into sheets of paper in order to fasten them together

A Stapler combines together sheets of paper or other materials by driving a thin metal staple through the sheets and folding over the ends to secure the paper. It is commonly found in offices, schools, or other places that process large amounts of paper.