Kekkei Genkai (血継限界 "Bloodline Limit") are abilities passed down genetically in specific clans. Most clans have developed special jutsu related to their kekkei genkai and their related jutsu cannot be taught or copied by others, as they require the specific genetic trait to work.
Kekkei Genkai abilities that work via the user's eye are called "pupil, or ocular, techniques" (瞳術, dōjutsu?), such as the Byakugan, Sharingan, and Rinnegan. Other kekkei genkai, like the First Hokage and Yamato's Mokuton ability, revolve around a simultaneous combination of two separate chakra elements.
Kekkei Genkai abilities that work via the user's eye are called "pupil, or ocular, techniques" (瞳術, dōjutsu?), such as the Byakugan, Sharingan, and Rinnegan. Other kekkei genkai, like the First Hokage and Yamato's Mokuton ability, revolve around a simultaneous combination of two separate chakra elements.
