The Sharingan is a special eye technique in the Naruto series that is possessed by members of the Uchiha clan. There are different levels of the Sharingan, including the basic three-tomoe Sharingan, the Mangekyo Sharingan, and the Rinnegan. Each level of the Sharingan grants the user different abilities and powers, with the Mangekyo Sharingan being a more advanced and powerful form. **

Orochimaru is a former member of the village of Konoha and a powerful ninja who sought to gain immortality and ultimate power through various means, including experimenting on others and stealing their abilities. He became obsessed with the Sharingan, a powerful dojutsu (eye technique) possessed by the Uchiha clan, due to its incredible abilities and potential for enhancing his own power. Orochimaru conducted experiments to try and obtain the Sharingan for himself, leading to conflicts with members of the Uchiha clan, particularly Sasuke Uchiha, who sought revenge against him for his actions. **

The choice between Byakugan and Sharingan ultimately depends on personal preference and the abilities one desires. Byakugan provides the user with exceptional vision and the ability to see chakra points, while Sharingan offers a wide range of powerful genjutsu and the ability to copy and predict an opponent's movements. Both dojutsu have their own unique strengths and weaknesses, so it's important to consider one's own fighting style and goals when making a decision. **

Kakashi's Sharingan is a borrowed eye that he received from his friend Obito Uchiha, while Sasuke's Sharingan is his own natural eye that he inherited from his clan. Kakashi's Sharingan is always activated in one eye, while Sasuke can activate both of his Sharingan eyes. Additionally, Sasuke's Sharingan has evolved further into the Mangekyo Sharingan and eventually the Eternal Mangekyo Sharingan, granting him more powerful abilities compared to Kakashi's basic Sharingan. **

Kakashi's Sharingan is a special eye technique that he acquired through a transplant from his friend Obito Uchiha. The Sharingan allows Kakashi to see chakra, predict his opponent's movements, and copy their techniques. It is a powerful tool that has helped Kakashi become one of the most skilled and formidable ninja in the Naruto series. **

Naruto's Sharingan is a special eye technique that is typically associated with the Uchiha clan in the Naruto series. It is a powerful dojutsu (eye technique) that grants the user enhanced visual perception, allowing them to see chakra, predict movements, and copy techniques. The Sharingan is characterized by its red iris with a number of tomoe (comma shapes) surrounding the pupil, with the number of tomoe increasing as the user's power and mastery of the Sharingan grows. **

Danzo's Sharingan is a unique and controversial aspect of his character. He obtained multiple Sharingan eyes through questionable means, including taking them from members of the Uchiha clan. This allowed him to enhance his own abilities and gain powerful techniques, but it also raised ethical and moral concerns about his actions. Ultimately, Danzo's use of the Sharingan reflects his willingness to do whatever it takes to achieve his goals, even if it means resorting to dark and unethical methods. **

Yes, Kakashi's Sharingan disappears after the Fourth Great Ninja War. During the war, Kakashi received the gift of Obito's Sharingan, which he used to enhance his abilities. However, after the war, Kakashi's Sharingan reverted back to its original state, leaving him with only his natural abilities. Despite losing the Sharingan, Kakashi continued to be a skilled and formidable ninja. **