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Article Contents

ABSTRACT

1.THE SPACETIME CONTEXT

2.THE GASEOUS ENVIRONMENT

3.MODES OF ACCRETION
3.1.Disklike Accretion
3.2.Starlike Accretion
3.3.Causes of Radiative Inefficiency

4.PHENOMENOLOGY OF BLACK HOLE ACCRETION
4.1.X-Ray Binaries
4.2.Active Galactic Nuclei
4.3.Tidal Disruption Events
4.4.Gamma-Ray Bursts

5.UNSOLVED PROBLEMS

6.LOOKING FORWARD

REFERENCES