On Inclusive B Decays

I briefly review the description of inclusive heavy hadron decays based on the inverse heavy quark mass expansion. In particular, I consider the transition $B \to X_u \ell \nu$ and the problem of extracting $V_{ub}$, mainly as far as the separation from the background represented by $b \to c$ modes is concerned. I also discuss how to obtain complementary information from the decay mode $B \to X_s \gamma$.