Quasars are compact, quasi-stellar objects. They are very bright and luminous, trillion of times brighter than the sun.
A quasar is a whole galaxy that shoots out a beam of energy from its north and south poles. A quasar is powered by a supermassive black hole. When matter falls into the black hole, the high speed spinning causes some of that matter to be ejected as beams of energy

They form when two galaxies collide.

Astronomy is hard for the human brain to perceive because we have difficulty processing such giant numbers and proportions and believing there are things  bigger than the planet we inhibit. Also, the idea of space being ENDLESS is truly impossible to imagine

Hope this helped :)