A breed is a group of domestic animals with a homogeneous appearance, behavior, and other characteristics that distinguish it from other animals of the same species. When bred together, animals of the same breed pass on these uniform traits to their offspring, and this ability—known as "breeding true"—is a definitive requirement for a breed. The offspring produced as a result of breeding animals of one breed with other animals of another breed are known as crossbreeds or mixed breeds. Plant breeds are more commonly known as varieties, or cultivars, and crosses between plant cultivars are referred to as hybrids. Breeds are usually not classified scientifically; however, they very well so can be if necessary; furthermore, breeds are usually classified according to similar characteristics.

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