A bong is a filtration device used for smoking substances like cannabis. It typically consists of a bowl for holding the substance, a water chamber for filtration, and a mouthpiece for inhalation. When the user inhales, smoke is drawn through the water, which cools and filters it before it reaches the lungs. Bongs come in various shapes and sizes, often made from materials like glass, plastic, or ceramic. They can also feature additional components, such as percolators, which further enhance the filtration process. Many users prefer bongs for their ability to provide smoother hits compared to other smoking methods.