[en] Measurements of the total cross section for γγ-> hadrons are presented. There are new results from double-tagging (P²not=0, Q²not=0), single tagging (P²approx.=0, Q²not=0), and no-tagging (P²approx.=0, Q²approx.=0n experiments at e⁺e^- storage rings. The measurements cover a Q² range from 0 to 100 GeV², and a W range from 2 to 20 GeV. The significance of these data for the interpretation of the photon as a set of vector mesons (VDM) and as an electromagnetic field quantum coupling to point-like quarks (QPM) is discussed. (orig.)