  I review the current status of the determination of Vus from a lattice
perspective. The recent progress are very impressive: computation with 2 + 1
and 2 + 1 + 1 dynamical flavours, physical pion mass, several fine lattices,
different discretisation of the QCD Lagrangian, etc. In this report, intended
for non-lattice experts, I give an overview of the situation for the
computation of fK /f{\pi} and f+(0), from which Vus and Vud can be extracted.
Besides the main features of the new computations, I also present some
theoretical ideas developed in the recent years which allow for a cleaner
determination of the relevant form factor f+ (0).
