Nobel prize in physics for the year 2017 has been awarded to the three American scientists for detecting gravitational waves. But, wait! First of all, what is this gravity and that wave refer to? If you are so solicitous to know about them, then this short compendium is for you. We have tried to explain everything about the gravitational waves in a concise way, as simple as possible, starting from its discovery to the recent detection and its scope in the future.