Radio galaxies are a type of active galaxy that emit intense radio waves from their nuclei. These galaxies typically have jets of charged particles that are ejected from their central supermassive black holes at relativistic speeds, producing synchrotron radiation in the radio frequency range. Radio galaxies are often associated with massive elliptical galaxies and are believed to be powered by accretion of material onto the central black hole. They are also known to have strong optical emission lines and visible jet structures in addition to their radio emission. Studies of radio galaxies provide insights into the physics of black hole accretion, jet formation, and galaxy evolution.