  The NA62 experiment at SPS is a continuation of the long standing CERN kaon
physics program. The high statistics and the unprecedent precision allow to
probe the Standard Model and test the description of the strong interactions at
low energy. The final results on the the lepton universality test by measuring
the ratio $R_K = \Gamma(K^{+}\to e^{+}\nu) / \Gamma(K^{+}\to \mu^{+}\nu)$ and
the study of the $K^\pm\to\pi^{\pm}\gamma\gamma $ decay are presented. The
major goal of the NA62 experiment is to perform a measurement of the $Br(K^{+}
\to \pi^{+} \nu \bar{\nu})$ with a precision of 10% in two years of data
taking. The detector setup together with the analysis technique is described.
