  We review recent lattice computations relevant for $D$ and $B$ decays. Decay
constants $f_{D,D_s}$, $f_{B,B_s}$, $D\rightarrow K (K^*)$, $B\rightarrow \pi ,
\rho$ semi-leptonic form factors together with the slope of the Isgur-Wise
function calculations are presented. Some recent results of $B\rightarrow K^*
\gamma$ form factors will be given. $1/M$ corrections to the asymptotic scaling
laws are discussed.
