  The acceleration of the expansion of the Universe has led to the construction
of Dark Energy models where a light scalar field may have a range reaching up
to cosmological scales. Screening mechanisms allow these models to evade the
tight gravitational tests in the solar system and the laboratory. I will
briefly review some of the salient features of screened modified gravity models
of the chameleon, dilaton or symmetron types using $f(R)$ gravity as a
template.
