  Since a few years, we have finally entered the era of discoveries of
multiply-imaged gravitationally lensed supernovae. To date, all cluster lensed
supernovae have been found from space, while those deflected by individual
galaxies were identified with wide-field ground-based surveys through the
magnification of "standard candles" method, i.e., without the need of spatially
resolving the individual images. We review the challenges in identifying these
extremely rare events, as well as the unique opportunities they offer for
time-delay cosmography and the study of the properties of the deflecting bodies
acting as lenses.
