  In Ultra Relativistic Heavy-Ion Collisions (URHIC's) the light vector mesons
play a crucial role in the description of hadronic interactions in a
non-pertrubative QCD region. In this region efective hadron models use
composite hadrons and mesons as field carriers instead of quarks and gluons.
This theoretical review article tries to give a short way of understanding the
underlying theory that we have for the conversion of vector mesons into photons
together with the so-called Vector Dominance Model (VDM) and the
electromagnetic form factors.
