Black holes belong to the field of astrophysics, which is a branch of physics. Astrophysics focuses on the study of celestial objects, such as stars, galaxies, and black holes, and the physical processes that occur in the universe. Black holes, in particular, are intriguing objects predicted by Einstein's theory of general relativity. They are formed from the remnants of massive stars that have undergone gravitational collapse, resulting in an extremely dense and compact region of spacetime from which nothing, not even light, can escape. The study of black holes involves understanding their formation, properties, behavior, and the effects they have on their surrounding environment, all of which fall under the domain of astrophysics.