  Kaon decays are an important testing ground of the electroweak flavour
theory. They can provide new signals of CP violation and, perhaps, a window
into physics beyond the Standard Model. At the same time, they exhibit an
interesting interplay of long-distance QCD effects in flavour-changing
transitions. A brief overview is presented, focusing on a few selected topics
of particular interest. A more detailed and comprehensive review can be found
in arXiv:1107.6001.
