What is Illuminati?what are its signs ?what does they do ?

You would need to research because it would take too much to explain on here.
BTW the illuminati is not Islam.

Please open the links below and may answer your question.

Illumination: the Secret Religion - The Illuminati (http://armageddonconspiracy.co.uk/The-Illuminati(903482).htm)

Illuminati (http://www.jesus-is-savior.com/False%20Religions/Illuminati/illuminati.htm)