Abstract
This chapter discusses the status of the measurements and the theoretical developments concerning the hadronic structure of the photon. The main idea is that by measuring the differential cross-section, one obtains the photon structure function F 2 γ . In leading order, the structure function F 2 γ is proportional to the parton content of the photon and, therefore, reveals the structure of the photon. In the region of small γstudied (γ≪C 1), the contribution of the term proportional to F L γ ( x , Q 2 ) is small and is usually neglected. In addition, because of the continuous improvements of the analyses and a LEP combined effort to obtain a better description of the data by the Monte Carlo models, the precision of the measurements has been improved considerably. The prospects of future investigations of the photon structure in the context of the planned Linear Collider program are very promising. The e + e - Linear Collider will extend the available phase space for the measurement of the Q 2 evolution of F 2 γ at medium x .
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