  The need for dark matter is briefly reviewed. A wealth of observational
information points to the existence of a non-baryonic component. To the
theoretically favoured candidates today belong axions, supersymmetric
particles, and to some extent massive neutrinos. The theoretical foundation and
experimental situation for each of these is reviewed. In particular, indirect
detection methods of supersymmetric dark matter are described. Present
experiments are just reaching the required sensitivity to discover or rule out
some of these candidates, and major improvements are planned over the next few
years.
