Black holes are enigmatic objects with gravitational pulls so strong that not even light can escape their grasp. Explore the formation of black holes through stellar collapse and the various types, including stellar-mass and supermassive black holes found in the centers of galaxies. Discuss the properties of black holes, such as their event horizons and singularities, and the observational evidence for their existence, including the detection of gravitational waves from black hole mergers. Furthermore, consider the implications of black holes on the structure and evolution of galaxies and the mysteries surrounding their interiors and information loss paradox.