  The most recent progress and future prospects in kaon physics are reviewed.
Main results are the first observation of the rare decays KS->pi0ee and
KS->pi0mumu by NA48, new K+->pinunu event observed by E949 and new precision
measurements of K0->pienu decays by KTeV, KLOE and NA48 made in an effort to
resolve the slight deviation from the unitarity in the CKM matrix, involving
the |Vus| coupling.
