  Rare K decays are an important testing ground of the electroweak flavour
theory. They can provide new signals of CP-violation phenomena and, perhaps, a
window into physics beyond the Standard Model. The interplay of long-distance
QCD effects in strangeness-changing transitions can be analyzed with Chiral
Perturbation Theory techniques. Some theoretical predictions obtained within
this framework for radiative kaon decays are reviewed, together with the
present experimental status.
