General Relativistic Magnetohydrodynamics (GRMHD) simulations are a computational tool used in astrophysics to study the behavior of magnetized fluids in the presence of strong gravitational fields. This research area combines the principles of general relativity, which describes the curvature of spacetime caused by mass and energy, with the laws of magnetohydrodynamics, which govern the behavior of electrically conducting fluids in the presence of magnetic fields. GRMHD simulations are used to study a wide range of astrophysical phenomena, including the accretion of material onto black holes, the formation of jets from compact objects, and the dynamics of neutron star mergers. By numerically solving the coupled equations of general relativity and magnetohydrodynamics, researchers can gain insights into the complex interactions between gravity, magnetism, and fluid dynamics in these extreme environments. Overall, GRMHD simulations play a crucial role in advancing our understanding of the behavior of matter under extreme conditions and are essential for studying some of the most energetic and violent events in the universe.