How are seyfert galaxies like quasars?

The supermassive black hole that powers active galactic nuclei has an accretion disc of material falling into it, and as that material falls into the black hole, friction and gravitational forces heat it to such a high temperature that it releases enormous amounts of radiation.

Quasars are extremely far-off objects that are billions of light years away. They release enormous amounts of energy; galaxies are not visible from quasars, but their radiation is. Quasars are believed to be the active nuclei of very young galaxies that existed billions of years ago.

About 10% of visible galaxies are Seyfert galaxies, which are visible galaxies with active nuclei that are less luminous and much closer than quasars.

Seyfert galaxies and quasars both exhibit extremely energetic phenomena originating from their cores, likely powered by supermassive black holes. They emit strong radiation across the electromagnetic spectrum, including visible light, ultraviolet, and X-rays.