The nucleon-nucleon interaction

We review the major pl ogress of the past decade concerning our understanding of the nucleon-nucleon interaction. The focus is on the low-energy region (below the pion production threshold), but a brief outlook towards higher energies is also given. The items discussed include charge dependence, the precise value of the pi NN coupling constant, phase shift analysis and high-precision NN data and potentials. We also address the issue of a proper theory of nuclear forces. Finally, we summarize the essential open questions that future research should be devoted to.