A speargun is a specialized tool used for underwater fishing. It consists of a long barrel, a trigger mechanism, and a spear or shaft that is propelled by elastic bands or compressed air. Spearguns allow divers to catch fish more efficiently and are commonly used in recreational and commercial fishing. These devices come in various types, including band-powered and pneumatic spearguns, each suited for different fishing conditions. Safety is crucial when using a speargun, as improper handling can lead to accidents. Proper training and adherence to local fishing regulations are essential for responsible use.