Mangekyou Sharingan, is a one kind of ninja technic used by the Uchiha Clan of Naruto Shippuden anime tv series. It is the second stage of Sharingan. This people of Uchiha Clan has to depend on their eyes to use it's power. Though Sharingan is the property of Uchiha Clan. It has been seen that by using medical ninjutsu Sharingan can use by others.
In the episodes of Naruto Shippuden Hatake Kakashi and Danzo can use Sharingan. But only Hatake Kakasi developed his eye to Mangekyou who dosen't belongs to Uchiha Clan. Though it is very difficult for him to use Mangekyou Sharingan because of his weakness.
But there is another rule to develop Sharingan and the rule is you must have another Sharingan eyes of a Uchiha member. For this reason so many audience asked that how could Hatake Kakasi developed his eyes into Mangekyou. On The other hand Danzo is the another Sharingan user who dosen't belongs to Uchiha Clan couldn't developed but he has collected so many Sharingan in his right hand and made a different techinc. How is this possible? In the anime series i have seen that Mangekyou Sharingan has three shapes. The Mangekyou Sharingan eyes of Uchiha Sasuke is like a red flower. The eye shape of Uchiha Ithachi is like a circle and the eye shape of Hatake Kakashi is like a wheel. If you have any explanation about it please explain.