sharingan

The Sharingan is a special ability found in the pupil of select members of the Uchiha clan. It is a pupil characteristic which is said to have been passed down from the Hyuuga's Byakugan, and then, with time, evolved.
The Sharingan has many abilities, but it's primary ability is to copy Nin, Gen, and Taijutsu.
There are two types of Sharingan. The underdeveloped Sharingan has two comma-like dots around the iris instead of the mastered Sharingan which has three. What is to be considered the Sharingan's ultimate ability is the Tsukiyomi.

1) Uchiha Sasuke can't perform Tsukiyomi early on in the anime/manga because of his underdeveloped Sharingan.

2) Hatake Kakashi is not part of the Uchiha clan and got his Sharingan through other means and because of this cannot fully master the Sharingan or even turn it off.

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Tsukiyomi

A special genjutsu (illusion) skill that Itachi is able to use with his Sharingan eyes. What it does it traps the victim into his mind where he is able to torture them mentally for what seems like days over a period of a few seconds.

Itachi uses this move on Kakashi by trapping him into his Tsukiyomi world and repeatedly stabbing him over a period of 72 hours which occurs in just a couple of seconds

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