Subtypes are specific categories or variations within a broader classification. For example, in biology, the term can refer to different varieties of a species, such as dogs being subtypes of canines. Each subtype may have distinct characteristics that differentiate it from others within the same group. In psychology, subtypes can refer to different forms of a disorder, such as depression having subtypes like major depressive disorder and persistent depressive disorder. Understanding subtypes helps researchers and practitioners tailor treatments and interventions to better meet the needs of individuals within each specific category.