What is wikileaks? why has it come to limelight these days though it has been founded years back?

whats so special abt it?i would like to know the answer in an easily understandable way...i m a student of 10th class....so please be brief in answering it....i would evn like to knw through my mail i.e. vinz.muzic@yahoo.in ...... plzz do answer it guys....i would b glad to knw abt it