Two-photon physics at LEP

Two-photon physics was one of the most active fields of research at the e+e− collider LEP. The measurements of the two photon total cross section, jets, charged hadrons and prompt photons production as well as the photon structure functions and the structure of interactions of two virtual photons have been performed at LEP using the process e+e−→e+e−γ(⋆)γ(⋆)→e+e−X, where X represents a pair of leptons or a hadronic final state. The results obtained by the LEP experiments in anti-, single- and double-tagged measurements are reviewed and compared with similar results available from other e+e− colliders and with theoretical predictions.