Accretion is the process by which matter is drawn into a massive object by its gravitational attraction. This process commonly occurs in astronomical objects such as black holes, neutron stars, and protostars. Accretion plays a crucial role in the growth and evolution of these objects, as well as in the formation of stars and galaxies. Researchers study accretion to understand the physics of how matter interacts with gravity, magnetic fields, and other forces in extreme environments. This research area involves theoretical modeling, observational studies, and numerical simulations to investigate the complex dynamics of accretion processes.