Cellular respiration is the process of which biological fuels are oxidised in the presence of an inorganic electron acceptor such as oxygen to produce large amounts of energy, to drive the bulk production of ATP.
Anaerobic respiration is used by microorganisms either bacteria or archaea  in which neither oxygen (aerobic respiration) nor pyruvate derivatives (fermentation) is the final electron acceptor.  Rather, an inorganic acceptor such as sulfate (SO), nitrate (NO), or sulfur (S) is used. Such organisms could be found in unusual places such as underwater caves or near hydrothermal vents at the bottom of the ocean., as well as in anoxic soils or sediment in wetland ecosystems.
In July 2019, a scientific study of Kidd Mine in Canada discovered sulfur-breathing organisms which live  below the surface, and which breathe sulfur in order to survive. These organisms are also remarkable due to consuming minerals such as pyrite as their food source.