Rapidly fast and invisible ripples in space are known as gravitational waves. Universe's birth, accelerating masses like an explosion of stars and collision on black holes generates gravitational waves. As they pass through, they stretch and squeeze all the things which intervene in their path. They travel with light's speed such as they cover the distance of 186 thousand within a second. They transmit energy in the form of gravitational forces. Elbert Einstein first introduced the concept of gravitational waves. Gravitational forces give information about gravity's nature and its origins.