Relativistic astrophysics is a fascinating field that explores the behavior of matter and radiation in the presence of strong gravitational fields. There are many synonyms for this term, including relativistic astrophysics and general relativity. Other terms that are commonly used to describe this discipline include high-energy astrophysics, which focuses on the study of cosmic rays and gamma-ray bursts, and black hole physics, which is concerned with the behavior of matter in the vicinity of these fascinating objects. In addition to these terms, there are many more specialized concepts and ideas that are commonly employed in the study of relativistic astrophysics, each of which contributes to our understanding of the Universe and its many mysteries.