A chainsaw is a gasoline, electric, or battery-powered portable saw with a set of teeth attached to a revolving chain that is propelled along a guide bar. It is utilised for tree felling, limbing, bucking, trimming, cutting firebreaks in wildfire suppression, and firewood gathering. As a tool for chainsaw art and chainsaw mills, chainsaws with uniquely designed bar-and-chain combinations have been invented. During building projects, specialised chainsaws are utilised to cut concrete. In Finland, chainsaws are sometimes used to cut ice for ice sculpture and winter swimming.