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At high energy, exclusive meson photo- and electro-production give access tothe structure of hadronic matter. At low momentum transfers, the exchange of afew Regge trajectories leads to a comprehensive account of the cross-sections.Among these trajectories, which are related to the mass spectrum of families ofmesons, the Pomeron plays an interesting role as it is related to glue-ballexcitations. At high momentum transfers, the exchange of these collectiveexcitations is expected to reduce to the exchange of their simplest (quark orgluon) components. However, contributions from unitarity rescattering cuts arerelevant even at high energies. In the JLab energy range, the asymptoticregime, where the players in the game are current quarks and massless gluonshas not been reached yet. One has to rely on more effective degrees of freedomadapted to the scale of the probe. A consistent picture, the PartonicNon-Perturbative Regime, is emerging. The properties of its various components(dressed propagators, effective coupling constants, quark wave functions, shapeof the Regge trajectories, etc) provide us with various links to hadronproperties. I will review the status of the field, will put in perspective thecurrent achievements at JLab, SLAC and Hermes, and will assess futuredevelopments that are made possible by continuous electron beams at higherenergies.

Exclusive Meson Photo- and Electro-production, a Window on the Structure of Hadronic Matter