Binary black holes are two black holes that are in close orbit around each other. These systems are extremely powerful sources of gravitational waves, which are ripples in spacetime caused by the acceleration of massive objects like black holes. Binary black holes are formed through the evolution of massive binary star systems, where each star eventually collapses into a black hole. Studying binary black holes can provide insights into the evolution of massive stars, the formation of black holes, and the properties of gravity itself. Additionally, the recent detection of gravitational waves from binary black hole mergers has opened up a new field of astronomy known as gravitational wave astronomy.