  We review lattice results related to pion, kaon, D- and B-meson physics with
the aim of making them easily accessible to the particle physics community.
More specifically, we report on the determination of the light-quark masses,
the form factor f+(0), arising in semileptonic K -> pi transition at zero
momentum transfer, as well as the decay constant ratio fK/fpi of decay
constants and its consequences for the CKM matrix elements Vus and Vud.
Furthermore, we describe the results obtained on the lattice for some of the
low-energy constants of SU(2)LxSU(2)R and SU(3)LxSU(3)R Chiral Perturbation
Theory and review the determination of the BK parameter of neutral kaon mixing.
The inclusion of heavy-quark quantities significantly expands the FLAG scope
with respect to the previous review. Therefore, for this review, we focus on D-
and B-meson decay constants, form factors, and mixing parameters, since these
are most relevant for the determination of CKM matrix elements and the global
CKM unitarity-triangle fit. In addition we review the status of lattice
determinations of the strong coupling constant alpha_s.
