  The Positron Annihilation to Dark Matter Experiment (PADME) uses the positron
beam of the DA$\Phi$NE Beam-Test Facility, at the Laboratori Nazionali di
Frascati (LNF) to search for a Dark Photon $A'$. The search technique studies
the missing mass spectrum of single-photon final states in $e^+e^-\rightarrow
A'\gamma$ annihilation in a positron-on-thin-target experiment. This approach
facilitates searches for new particles such as long lived Axion-Like-Particles,
protophobic X bosons and Dark Higgs. This talk illustrated the scientific
program of the experiment and its first physics results. In particular, the
measurement of the cross-section of the SM process $e^+e^-\rightarrow
\gamma\gamma$ at $\sqrt{s}$=21 MeV was shown.
