  In recent years, disorder has been shown to be crucial for the understanding
of diluted magnetic semiconductors. Effects of disorder in these materials are
reviewed with the emphasis on theoretical works. The types and spatial
distribution of defects are discussed. The effect of disorder on the intimately
related transport and magnetic properties are considered from the viewpoint of
both the band picture and the isolated-impurity approach. Finally, the
derivation and properties of spin-only models are reviewed.
