  The theory of large deviations is already the natural language for the
statistical physics of equilibrium and non-equilibrium. In the field of
disordered systems, the analysis via large deviations is even more useful to
describe within a unified perspective the typical events and the rare events
that occur on various scales. In the present pedagogical introduction, we
revisit various emblematic classical and quantum disordered systems in order to
highlight the common underlying mechanisms from the point of view of large
deviations.
