X-ray astronomy is a branch of astronomy that focuses on studying celestial objects and phenomena using X-ray radiation. X-rays are a form of high-energy electromagnetic radiation that can be emitted by extremely hot and energetic astronomical objects such as black holes, neutron stars, supernovae, and active galactic nuclei. X-ray telescopes and detectors are used to detect and study these X-ray emissions, allowing astronomers to explore the high-energy processes happening in the universe. X-ray astronomy has provided important insights into the nature of black holes, the properties of hot gas in galaxy clusters, and the dynamics of supernovae explosions. Overall, X-ray astronomy plays a crucial role in our understanding of the universe and is an important tool for studying some of the most extreme and energetic phenomena in the cosmos.