  Parton distribution and correlation functions describe the relation between a
hadron and the quarks and gluons (or collectively, the partons) within it, and
carry rich information on hadron's partonic structure that cannot be calculated
by QCD perturbation theory. In this talk, I will review what lattice QCD can
and cannot do for calculating the parton distribution and correlation
functions, and the new ideas and efforts around the world to explore nucleon
structure from lattice QCD calculations by combining the strength of both
lattice QCD and perturbative QCD in such a way that is complementary to our
on-going effort to extract these fundamental functions from experimental data.
