  Light and heavy-light (b) hadrons are among the most interesting and among
the most challenging quantities to calculate in lattice gauge theory. One would
like to avoid discretization effects from very heavy quarks and to calculate
chiral extrapolations and to calculate finite volume effects from light quarks
or to minimize these effects. For this one uses effective theories: Chiral
Perturbation Theory and Nonrelativistic QCD or Heavy Quark Effective Theory.
Lattice results are reviewed on hadrons containing light quarks and light and b
quarks, and discussed in the framework of effective theories.
