The "variety" of a tree or plant is a term that refers to the genetic differences within a species. A variety is a group of individuals that share some characteristics that distinguish them from other members of the same species. For example, apples are a species of fruit trees, but there are many varieties of apples, such as Gala, Fuji, Granny Smith, etc. Each variety has its own traits, such as color, shape, size, flavor, and resistance to pests and diseases. Varieties can arise naturally through mutations or hybridization, or they can be artificially created by humans through selective breeding or genetic engineering.