What is the accretion disk of a black hole and how does it contribute to the feeding process of the black hole?

The accretion disk of a black hole is a swirling disk of gas and dust that orbits around the black hole. As material from the disk falls towards the black hole, it heats up and emits energy in the form of X-rays and other radiation. This process of material falling into the black hole through the accretion disk is how black holes "feed" and grow in mass.