Gamma-ray astronomy is a branch of astronomy that focuses on studying celestial objects and phenomena that emit gamma rays. Gamma rays are the most energetic form of electromagnetic radiation, with wavelengths shorter than X-rays, and are typically emitted by extremely violent and energetic processes such as supernova explosions, black holes, and pulsars. One of the key tools in gamma-ray astronomy is the use of space-based telescopes and detectors, as gamma rays are absorbed by Earth's atmosphere and cannot be observed from the ground. Instruments such as the Fermi Gamma-ray Space Telescope and the H.E.S.S. telescopes have been essential in studying sources of gamma-ray emission in the universe. By studying gamma rays, astronomers can learn more about the high-energy processes that occur in our universe, such as the acceleration of particles to near-light speeds, the formation of massive black holes, and the interaction of cosmic rays with interstellar gas and dust. This field of research has greatly expanded our understanding of the most extreme and energetic events in the cosmos.