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Extended Red Emission (ERE) is a widely observed optical emission process,present in a wide range of circumstellar and interstellar environments in theMilky Way galaxy as well as other galaxies. Definitive identifications of theERE carriers and the ERE process are still a matter of debate. Numerous modelshave been proposed in recent decades, often developed without consideration ofthe growing body of observational constraints, which by now invalidate many ofthese models. This review focuses on the most well-established observationalconstraints which should help to delineate the way toward a generally acceptedexplanation of the ERE and an understanding of its place in the radiationphysics of the interstellar medium.

Extended Red Emission: Observational constraints for models