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Abstract
This paper reviews the chief observational phenomena that define interstellar scintillation (ISS) and have given evidence for a widespread distribution of plasma turbulence on very small scales. Though ISS was discovered in pulsars and is still a major perturbation of their signals, it is now also recognized in a variety of fluctuations in the flux density from quasars and Active Galactic Nuclei (AGNs).
Acknowledgements
I thank the organizers and Pushchino Radio Astronomy Observatory for arranging this symposium and for their hospitality. I thank the US NSF for support under grant AST 0507713.