In the year 1916, Albert Einstein theoretically showed that his equations (which describe the very nature of gravity) admit wave-like solutions. Gravitational waves, as Einstein first described, are the ripples of the space-time that are generated if the gravitational field of an object changes: just like an oscillating charge produces electromagnetic waves oscillations of a mass would produce gravitational waves. Almost hundred years after Einstein predicted the existence of gravitational waves, the two LIGO detectors made their first direct detection of gravitational waves from an event that took place about 1.3 billion years ago. Based on the observed properties of the detected signal it is clear beyond any reasonable doubt that these waves were produced by the merger of two heavy black holes. In this talk, I would present a discussion on the observation of this event by LIGO, our current understanding of its properties and the science it offers.