Sorry Sir
The Sharingan is a KG coming from the Uchiha clan. Only the Uchiha clan members are able to awaken a sharingan though not everyone is able to do so. Only other exception to this rule is that it can also be operated on. For example Kakashi is not a member of the Uchiha clan however he has the sharingan and able to use it.
There are three stages to the sharingan which is shows on the users eye from the moment it gets activated. Depending on what stage it has been awaken it will show up around the center pupol to three pupils called the Tomoe.
Each stage has it's advantages and the more Tomoe you have the more powerful the KG becomes. Ofcourse it's all depending on the users abilities as well.
One of the great advantages that I know of is that it is able to sense chakra flow throughout the body and which in turn gives the user highend sense of abilities during the time it is activated. The user is also able to use genjutsu with the sharingan. The effectiveness and the power determines how hard the user had trained and battled with the sharingan.
Select few members of the Uchiha clan possess the ability to activate the bloodline Sharingan eye. This doujutsu (eye skill) gives one the ability to read Genjutsu, Taijutsu and Ninjutsu and then defeat it. As such, the clan member can view a technique being performed and see the tricks and movements required to be able to complete it. However the clan member can not copy techniques which are unique to another bloodline. It also gives one the ability to cast jutsu techniques only possible by possessing the eye such Amaterasu, Kamui, Susanoo and Tsukuyomi. The clan itself is known for their ties to fire. For a clan ninja to be seen as an adult, they must be able to utilize a Katon (Fire Element) jutsu such as Goukakyuu no Jutsu. Thus is the tie between the manipulation of fire and the mind of an Uchiha member.