The Hyūga clan is one of the four noble clans of Konohagakure. All members born into this clan possess the Byakugan, a kekkei genkai that gives them extended fields of vision and the ability to see through solid objects and even the chakra circulatory system, amongst other things, and expel chakra from any of the tenketsu in their body.
The clan is separated into two parts, the Main House and the Branch House, a system that protects the secrets of the Byakugan from outsiders. The Main House runs the family while the Branch House protects it. The members of the Branch House are branded with a cursed seal upon the third birthday of the heir to the Main House. This seal gives the Main House members absolute control over the branch members, because they can destroy the branch members' brain cells with a simple hand seal, or cause them great pain to punish them. This seal also makes sure the secret of the Hyūga's Byakugan is safe, because it seals the Byakugan after the wearer of the seal dies. Because they are essentially servants, simply because of their birth order or heritage, some Branch House members are hostile to those of the Main House.
Located near the western boarders within the Leaf village, the Hyuga clan remains absolute in staying away from village politics. This has caused the clan to stay strong and remain as one of the noblest clans in Konohagakure.