  The importance of charm decays in the context of flavor is motivated. A
theory overview on recent developments in leptonic and semileptonic decays,
hadronic two-body decays, and rare decays is presented. Standard Model (SM)
predictions as well as tests of the SM are pointed out, {\it e.g.}~how to
discover direct CP violation in charm decays and how to search for physics
beyond the SM. Differences between rare charm and beauty decays are discussed.
