A pine is any conifer tree or shrub in the genus Pinus of the family Pinacae. Pinus is the sole genus in the subfamily. Pinoideae. The Plant List compiled by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts 126 species names of pines as current, together with 36 unresolved species and many more synonyms. The American Conifer Society (ACS) and the Royal Horticultural Society accept 121 species. Pine may also refer to the lumber derived from pine trees; pine is one of the more extensively used types of wood used as lumber. The pine family is the largest family within conifers, and there are currently 818 named cultivars, or trinomials, recognized by the ACS.
Pines are among the most commercially important tree species valued for their timber and wood pulp throughout the world. In temperate and tropical regions, they are fast-growing softwoods that grow in relatively dense stands, their acidic decaying needles inhibiting the sprouting of competing hardwoods. Commercial pines are grown in plantations for timber that is denser and therefore more durable than spruce (Picea). Pine wood is widely used in high-value carpentry items such as furniture, window frames, panelling, floors, and roofing, and the resinof some species is an important source of turpentine.