Review of experimental results on photon-photon interactions

Experimental results on two-photon production of hadronic final states are reviewed. The radiative widths of the resonances eta', f0, and A2 have been determined and for the exclusive channels π+ π-, π+ π- π+ π-, and panti p the cross sections near threshold have been measured. The investigation of inclusive multi-hadron production has given evidence for a direct, point-like coupling of the photons to quark pairs and for jet production in two-photon collisions. A first measurement of the structure function F2(x,Q2) of the photon has been reported. (orig.)