Campaign buttons are used in an election as political advertising for (or against) a candidate or political party, or to proclaim the issues that are part of the political platform. They are commonly used for awareness campaigns and worn as novelty items on hats, shirts, and backpacks.
Celluloid" buttons, first used in 1896, one side of the metal disk is covered with paper (printed with the message) and protected by a layer of clear plastic. Thousands of buttons are produced and distributed to the public. A celluloid-type button is fastened to a garment using a pin on the back side of the button (in recently-produced buttons, the pin generally fits into a safety-pin-style catch).
Campaign buttons bear some similarity to bumper stickers, which are also used for political and other promotional messages. As a novelty item, campaign buttons are part of the the hobby of collecting.