The Hyuuga Clan Byakugan

The Byakugan, which translates directly into "White Eyes" is a special technique that can only be used by advanced bloodlines such as the Hyuuga clan. This special technique has everything to do with the users eyes, which literally turn into White eyes.
The Byakugan is far different from the Sharingan however, unlike the Sharingan this technique can not copy moves. Although it can not copy moves, the Byakugan may just be better then the Sharingan, as Kakashi admits.

The Byakugan gives the user the unique and devastating ability to be able to see through nearly anything, as well as the ability to know what a person is thinking just by the movements of his/her eyes. A good example of this would be in episode 46, when Neji telles Hinata that because she is looking to the top-left corner of her eyes she is recalling a painful past event.
Along with the two previously mentioned great abilities that the Byakugan has, it also posesses the extremely deadly ability to be able to see the opponent's inner Chakra Center, and be able to attack it directly! In the case of Hyuuga Neji, he is able to see his opponents Tenketsu (chakra points) and attack them. This is a very remarkable ability when you take into consideration that there are 361 points throughout the body on the Keirakukei (chakra highway), and each point is just about the size of a needle point. If they are hit directly, they could theoretically stop that persons chakra flow altogether.
With all those fascinating abilities, the Byakugan can still do more! It gives the user the ability to see 360 Degrees around him. This means that a Byakugan user cannot be attacked from behind, unless the attacker is extraordinarily fast.
المصدر .. NarutoFan