A confetti cannon is a device that shoots out confetti or other smaller pieces of paper into the air in a large burst. Although they were once fairly rare, they are now available for purchase on many websites and can be found at many party supply stores.
The thing that shoots out confetti is called a confetti cannon. They are high-powered devices that send brightly colored paper scraps into the sky in a grand display. The most common color of this paper is rainbow because it's bright and fun to look at. The cannons can be easily obtained by ordering them online or checking them out from party supply stores near you.