Current knowledge suggests that the whole range of strong interaction phenomena can be described by quantum chromodynamics, a theory with only few parameters. On the experimental side, the masses of the light hadrons and many other properties are very precisely known. On the theoretical side, it is difficult to compute these quantities from first principles, mainly because the coupling constant is not small at low energies and a perturbative expansion in this parameter can not be carried through. The framework of Lattice QCD is appropriate to address this problem on a non-perturbative level....