The quark and gluon structure of the nucleon has long been
only known via 1-dimensional distribution functions which
gives the momentum of the quarks or gluons along the direction
of the momentum transfer of whatever scattering probe is used.
Recent theoretic and experimental work has opened a new field
of measurements which allow one to study the three dimensional
structure of the proton. After reviewing the basic aspects of
proton structure, these new methods and the first results will be
presented.