  Leptonic and semileptonic decays in the charm sector have been well studied
in recent years. With the largest data sample near $D\bar D$ threshold,
precision measurements of leptonic and semileptonic decays of charm meson and
baryon are perfromed at BESIII. Test for letpon flavor universality is also
performed. Sensitivity for rare leptonic and semileptonic charm decays is
significantly improved taking advantage of the huge statistics in LHCb and the
$B$ factories.
