thumb|Stack of firewood next to a building thumb|Stack of split firewood and a splitting maul, Czech Republic
Firewood is wood that has been cut and often split into pieces suitable for burning in fires, stoves, or fireplaces. It serves as a fuel source for heating and cooking, and remains an important energy resource in many parts of the world.
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thumb|Stack of firewood next to a building thumb|Stack of split firewood and a splitting maul, Czech Republic
Firewood is any wooden material that can be used for fuel. The term usually refers to wood fuel that is not industrially processed, such as wood pellets, and instead takes the form of a recognizable log or branch. Firewood can be heat-treated and seasoned (dry) or unseasoned (fresh/wet). Two classes of firewood exist, which are either hardwood or softwood, depending on the species of tree that was cut. thumb|Bucking, splitting, and stacking logs for firewood in Kõrvemaa, Estonia (October 2022)
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