  The viscous slowing down of supercooled liquids that leads to glass formation
can be considered as a classical, and is assuredly a thoroughly studied,
example of a "jamming process". In this review, we stress the distinctive
features characterizing the phenomenon. We also discuss the main theoretical
approaches, with an emphasis on the concepts (free volume, dynamic freezing and
mode-coupling approximations, configurational entropy and energy landscape,
frustration) that could be useful in other areas of physics where jamming
processes are encountered.
