The recently introduced concepts of Generalized Parton Distributions (GPD)
are reviewed in an introductory and phenomenological fashion.
These distributions provide a rich and unifying picture of the nucleon
structure. Their physical meaning is discussed.
The GPD are in principle measurable through exclusive deeply virtual
production of photons (DVCS) or of mesons (DVMP). Experiments are starting to
test the validity of these concepts. First results are discussed and new
experimental projects presented, with an emphasis on this program at
Jefferson Lab.
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