The Sharingan is one of the visual dojutsu(eye techniques) kekkei genkai(bloodline traits) of the Uchiha clan, being their weakest, yet quite formidable one. it is recognizable for its red iris and black tomoe pattern. When first awakened, the Sharingan only has one tomoe, which increases to a maximum number of three as its developed. Three signifies the Sharingan is fully mature. The powers of the Sharingan are that it allows its user to see chakra, read it to determine what jutsu their opponents may use, predict physical movements, copy elemental jutsu for their own use, and weild various kinds of genjutsu(illusionary techniques) against adversaries. Depending on the user's level of skill performing genjutsu, they can control various living things, including animals, other humans, or even Tailed Beasts(this feat only Madara Uchiha and his apprentice, Obito, have accomplished). It has much more powerful variations known as the Mangekyo Sharingan and Eternal Mangekyo Sharingan, which can be attained through different means. The Sharingan is also the starting point of development for the legendary dojutsu known as the Rinnegan.